PhantomzK

I think the reason why he only sees color related to her all depends on how his powers work. For this I pose a theory:

All of their powers work according to the timeline they originate. What has happened and what will happen has already happened as per the timeline. All we are seeing, even the "timetravelling" and "precognition" are things that have already happened, only in different sequences from our and their POV. The MC's powers work as a corrector or balance to the timeline to make sure it doesn't stray. He is destined to save the FL, thus why only she has color. The moms "precognition" abilities also work in a way that seemingly "manipulates" fate to do their bidding, which is how she got rich in the first place, but even that is predestined. Choice does seem to be a factor in the sense that she can choose to accept "fate" by following her dreams or doing something to avoid it, etc. but in all likelyhood, it is all part of fates manipulations to maintain the timeline. Thus she gets rich through her dreams because she was meant to become rich through them. She hasn't actually changed her original fate because fate meant it for her. The MC's powers are similar. In a way, when he travels back in time, he enters a separate reality in which the only differences could be the existence of the FL up to a certain point. To maintain his original timeline, he has to save her. If for some reason he doesn't then the timeline changes and she more than likely does not exist in that timeline. But, considering how things have happened so far, pretty much none of them have changed fate. Fates hold on them is very strong and he will likely end up saving her either way to maintain the current timeline.

It was also said that the mom was scammed herself due to "love" and served 3 years in prison. I'm guessing that the guy who scammed her is the same guy scamming the MC's dad.

Whats the possibility that the FL is a distant relative of the family and so she also has abilities that she never knew about? Perhaps her abilities influence the abilities of others such that she becomes the central figure for those who are precognitive or for those like the ML, she becomes the only one he can interact with in the past. Its like some sort of radar when she is "nearby" or something.

Its possible that the mother dreamed the wife with someone else. Plus the relationship between the ML and his dead wife were already straining it wouldn't be a surprise if something happened between the wife and someone else within those 7 years. Perhaps she was feeling guilty and was grasping at straws the moments before her death, hoping that the ML would come to his senses finally and put their family first. She was probably looking for reliance in him despite being in a depressed state herself (probably due to guilt from "cheating". one night standing maybe?). The ML failed to meet her expectations and eventually led to her death (which seemed to be suicide). Essentially the MC disappearing at that moment to her meant that he chose others before her and their daughter. She wanted to choose him but realized that he couldn't do the same for them.

At least thats my speculation.

She hasn't been shown to be the best at making decisions in any case. Her entire fortune has clearly been completely dependent on her precognitive abilities. Without them her entire fortune would fall which is seen by their declining wealth after their loss in power.
The reason why she thinks the dead wife cheated on her son is completely dependent on the belief that her granddaughter has not exhibited any ability. She doesn't take into account the possibility that she is purposefully hiding it. Thats because she only sees the abilities as a gift, not taking into account that to some people, it may come off as a curse.

Technically she was raised in isolation and didn't rlly interact on a deep level with others. The only ppl she was surrounded by were her grandmother/master and disciples who were akin to protectors rather than friends. If she was introverted to begin with, growing up in isolation without friends likely doesn't help. The MC was likely the only outside figure as well as only man she had ever seen before the series beginning and he made a huge impression on her as a child which is why she regards him with so much dependence. Her childlike memories carried onto the present because she was constantly thinking of him in relative isolation.

She's the descendant of the Goddess Nuwa, so she's technically a demigod. She's half human, which is why she has a human form. But because her goddess half is that of a snake (Because Nuwa has a Snake lower half) a lot of ignorant people think she is a demon. Because Snakes or most "beast people" in xianxia's are typically demons.

Basically. Thats why in the webtoons only humans go through monsterization. Variants don't, but in a way they're a different kind of "monster" in themselves.
You can look up most of the things yourself on the wiki. Just google Sweet Home Wiki or Shotgun Boy wiki.

Sang Won is Ui Myeong. That was revealed at the end of S2. Sang Won is a parasitic creature that can transfer bodies. When his original body became too "damaged", he tranferred bodies. And when that body got too damaged, he transferred bodies again.
In the webtoon, the "variants" had the ability to morph into the identities of the victims whos brain they consumed, inheriting their memories and skillset. Sang Won doesn't have the exact same ability but the stealing identity and inheriting memory aspect seem to exhibited to some extent.
In the webtoon, the "variants" lived relatively normal lives in human society until they were captured and experimented on by humans, developing an immense hatred towards humanity. Thats quite the same for Sang Won's situation with him being captured and experimented on by the government. The others we see in the abandoned lab near the end of S2 are likely recruits that he found who suffered similar situations as he did.
One thing to note though in the Webtoon is that One essentially became the most powerful being by consuming other variants including "Zero", which is why he was able to start the monsterization outbreak. That does not seem to be the case in the drama so we will have to see how they tackle that aspect of the story.
In the webtoons the monsters are basically the true manifestation of a humans soul. They remain human when their soul is dormant. What happens during monsterization is the awakening of the soul which causes a physical change in the body and in most cases the consciousness becomes trapped in a dream to live out their desires as their soul gains control of their body. Which is why I said there is an implication of a separation between human and soul. Which also explains why variants are intelligent despite not having a soul.

So I looked up a bit of the background behind monsterization from the webtoons between "Sweet Home" and "Shotgun Boy" and from what it seems like to me is that the "Ui Myeong" aka "Sang Won" was probably not a "Monster" but instead was a "Variant". I think he is adapted from "One" in the webtoons. They definitely changed the character a lot and probably referenced several other characters for his template but the main template definitely seems to be "One". The seemingly "Half-Monsters" that we see in the lab are likely fellow "Variants" who have been held captive to be experimented on before the monsterization event. In the webtoons "One" was the one who started the monsterization event but thats hard to say here. A key difference that they added in the drama is that Sang Won had a wife and now a "Monster Child". In the webtoons, "Variants" are known as beings without a "Soul" as opposed to "Monsters" who have their "Souls" take over their bodies. Basically the process of "monsterization" implies a separation between humans and their souls, but when the 2 come together and the "soul" wins in taking control, they lose their humanity to become monsters. The reason I mention this is because the "child" of Sang Won would essentially be the child between a "Variant" and a "Human", a being without a Soul and one that does. Her character is also eerily reminiscent of another character from "Shotgun Boy" despite massive differences in personality and some of her power sets. This character is "Zero" who had the ability to pretty much turn people into "monsters" and was essentially a "God-like" character with an immense healing factor. These 2 abilities are very much seen in the "Child but it also includes seeing someones past through touch, an ability that Hyun Soo has and probably the child does as well. In the webtoon, his abilities are assimilated by "One" and "One" starts the monster outbreak. So if we extrapolate from that it may be possible that Sang Won was the one who started the monster outbreak somehow after unlocking certain abilities from his torture, developing an immense hatred for humanity and having a god-like complex to develop a superior race under his rule. The change is that the character adapted from the character "Zero" has become the child of the character adapted from "One".
Hyun Soo has taken the role of Gyuhwan in "Shotgun Boy" in being the guide for the child in developing their humanity as Gyuhwan pretty much was for "Zero".
The scene where the child turns her mother into a monster is akin to "Zero" turning "Miseon Ahn" into a Cocoon. Of course there are massive differences in why and how the 2 scenarios played out but the similarity lies in attempting to do "good" for a loved one by turning them into something without their consent.
The cocoons that we see in the drama are the state that monsters will eventually become once the humans in them have seen through all of their desires and no longer have any, eventually evolving into a new race of humans called "Evolved Humans" whom have no desires and their only goal is to create more of them.

It makes sense if the one behind the original (Probably this Noah guy) had key data components on him that he disappeared with and what Fan Xiaoxiao and her team are working with are basically incomplete data. I'm assuming that they are trying to replicate the success that was seen in Qi Lian so that she can use it either on herself or the people around her.

Mr. Xu is likely a programmed AI made to guide participants. Noah might have even transplanted/encoded his own memories or something successfully into the system as a precaution. After all, if one can completely swap someones memories, its not a stretch to encode memories into an AI, essentially living on within the simulation in a way.

So after episode 24, I'm thinking that perhaps this Fan Xiaoxiao took over the Lighthouse System project to take away her own pain in life. I say this because she clearly feels a lot of unhappiness and resentment due to her past relationships. Either she wants to take away her own pain by using it on herself eventually or she plans on using it on the people she's close to like Jiang Bo in order to make them more obedient towards her. Every test subject prior are just disposable guinea pigs. Thats why she has people just spying on and observing Jiang Xiaoyuan. She wants to see how she will turn out since the previous test subjects essentially ended up as failures. I think the initial Lighthouse System showed success in Qi Lian but something happened to the company afterwards and a lot of data got lost so when Fan Xiaoxiao took over the plans for it, she has incomplete data and is trying to replicate the success that was Qi Lian.

Considering the situation and the abruptness of that kiss it would be more unnatural for her to have closed her eyes. There are 2 instances in which she would close her eyes when kissed suddenly, 1. She accepts the kiss and follows through, or 2. She forcefully closes her eyes in disgust and more than likely would push him away. Neither of these are the situation since it was a surprise kiss that caught her off guard and she has no idea what to do because she is in a state of shock and confusion. She isn't really against it since she clearly has feelings for him too which is why she doesn't push him away or forcefully close her eyes. She also isn't getting into it because she is mentally drawing a line with him for his sake. Thus, the acting in that scene with her eyes open and going left and right as a sign of confusion is actually pretty on point imo.

I don't think thats the case. I think it was created in a lab with experiments on Anthrax or something. We learn in episode 3 that the spores it spreads is Anthrax, so the creature is more than likely a result of a genetically modified version of Anthrax.

The scifi is likely referencing the human experimentation creating a monster.

They likely "suicide" because they are unable to accept reality since they have lived a completely different life in their memories, much better than their current. Thus their "insanity" is more likely a case of extreme anxiety and stress induced by a denial of reality. After all, "suicide" is often used as a way to escape reailty.
If one accepts reality as it is and properly goes through the stages of grief then they probably won't go down that path. A good support system is necessary. So the FL and ML are likely going to be that support system for each other. Something "good" in this life that makes losing their other life a lot more bearable.

It could be that the FL is actually dead irl and he is coping in the sim with her returning to him.

I'm also thinking thats his mother. As for whether the FL is real or not, I'm leaning towards she is. The simulations reflect their desires in life. Perhaps irl his mother is the one who is alive and the dad is not in the picture. Considering that in the world we see, the dad is estranged but trying to connect with him, maybe irl he cheated on the ml's mother and never got to reconnect with him. If she truly is his mother, she seems pretty vindictive in that teaser, so that wouldn't be a surprise. The video mentions that she is very "mentally controlling", so perhaps internally he felt it was perhaps better without her in the picture, which is why that translated with her being dead.
I do think that he had a past with the FL irl and perhaps they grew apart (Perhaps his mother played a role in that). That aspect of his life translated to the FL disappearing in his life and reappearing and them falling in love together.

Ok so from the looks of it, 2025 timeline is almost definitely the simulated one. However, I don't think the 2018 one is real either. I think its a serious case of "Inception" (That reference for sure was hinting at something). Its a case of a simulation within a simulation. Xu Jing yang probably does exist in the real world but not in the simulated 2018 reality. However, his experiences in the real world are mostly reflected in this simulation, the only difference being the existence of Xu Jingyang. In fact, he might really be the creator of the Lighthouse System irl. But, perhaps something happens to the System and now someone or something else is in control. In the simulated reality, similar experiments are being carried out by a shadow company with less righteous reasonings leading to the 2025 simulated timeline in which events are directly controlled by the company. The reason why Huo Boyu and Jiang Xiaoyuan have different memories about how they got to the 2018 world is because Huo Boyu was directly manipulated by the system whereas Jiang Xiaoyuan escaped the system through her accident. The only confusion with this theory how she ended up where she woke up initially.