Another Theory Time: (with 80% chance of it being wrong)
What if SY knew it was KJ all along? What if his revenge on FL is only small but crucial part of his grand revenge plan? KJ mentioned that he can easily read people's intention, so SY need to throw KJ off and make him believe that his actions and angers are mostly towards someone else. That's why SY told KJ "I won't forgive anyone for hurting my PARENTS". Yes not only dad, but also his mom.
Ofc he is not faking his anger towards FL, after all, she killed his dad and remained unremorseful even after she was released from prison. His dad might not be innocent but her revenge vigilante justice by killing him in the name of her child is taking it too far. Just because she paid for her crime in the eye of society doesn't mean the effects she indirectly caused to bereaved family are gone, so he needs her to pay for it. How? By destroying her "perfect" life like she did his and then use/blackmail her to attack KJ.
Essentially, to kill with a borrowed knife or create a situation like "A mantis stalking a cicada is unaware of an oriole behind" by pitting KJ against FL's family then swooped in when KJ is at his lowest.
"I'm going to go all the way. Until I reach her end or mine."
I mean, why would his failure in taking revenge ON HER lead to his end? UNLESS...his plan A to use FL to take down KJ failed, she reached her end, which will then mean that SY needs to take KJ down personally as plan B. If he failed then it's his end.
Since the affair between the husband and sister is revealed, what if on the day of the child's death, they were having an affair, the sister ran away, the child followed her (to record a video for his mom), and she accidentally pushed him away towards Seonyul's dad's car (or Kim Jun's)? That's why the dad said "Why did he have to get hit by my car?"
It was an ACCIDENT and his dad still should have gotten harsher punishment for PURPOSELY delaying the kid's medical treatment (which is the primary reason that lead to the child's death) and for saying those unremorseful things to FL, but to KILL him out of anger and unremorsefully said she would do it all over again or that she didn't regret her revenge, ofc Seonyul will retaliate.
Two wrongs don't make a right and life for a life don't make it even. In the end, two lives are lost and two families are broken. One lost a child and one lost a father.
Now what if when Seonyul's investigated the accident, he found out about the cheating couple? In his perspective then it was them that lead to these tragedies. To be honest, what Seonyul did is so...small? Like yeah he sent pictures to destroy her family and happiness, but it was them first who betrayed her. He only revealed to her what is actually ALREADY happening. His revenge agendas seems stronger on Yuri with her estranged biological mom finding her again and with Suho with losing his wife, marriage, and nation's husband image. The cheating couple seems to have a lot more to lose due to his actions.
For now I still have no theories on Seonyul's mom's accident. Kim Jun might be the reason but why?
From Seonyul's perspective, his dad is a good father who accidentally killed a child in a hit run and was going to be punished for it (albeit just for a short time due to Kim Jun's intervention). He probably didn't know about what his dad said to FL, only the remorse he has shown in court, apologizing to FL for what he did. So then he sat in the courtroom for FL's trial, hoping to hear the same apology FL expected from his dad that night, only to hear the similar cold response that she didn't regret anything and would do it all over again. Seonyul's experience mirrored that of the FL but for the fact that his dad killed her child, her crime has become "excusable".
Her revenge vigilante justice had led to Seonyul and his mom becoming a collateral damage. In a way, she indirectly lead him to a worser fate than just being a murderer's son by leaving him without his dad's protection. Her life after prison seems to go back to "perfect" too despite the ever presence pain of losing a child. Her mom's restaurant was still doing well, her sister was now a CEO, and her now successful husband wanted her back. She even went on TV to talk about her experience and pain, so he must have felt that it's unfair that her killing his dad seemed to change nothing in her life but change everything in his life. So now he wanted to destroy that seemingly "perfect life" illusion with his own revenge vigilante "justice".
I think this drama is not about who is more likeable or unlikeable, or about whose side you are on, or who you can empathize and understand more. It's more about how revenge begets revenge.
What if SY knew it was KJ all along? What if his revenge on FL is only small but crucial part of his grand revenge plan? KJ mentioned that he can easily read people's intention, so SY need to throw KJ off and make him believe that his actions and angers are mostly towards someone else. That's why SY told KJ "I won't forgive anyone for hurting my PARENTS". Yes not only dad, but also his mom.
Ofc he is not faking his anger towards FL, after all, she killed his dad and remained unremorseful even after she was released from prison. His dad might not be innocent but her revenge vigilante justice by killing him in the name of her child is taking it too far. Just because she paid for her crime in the eye of society doesn't mean the effects she indirectly caused to bereaved family are gone, so he needs her to pay for it. How? By destroying her "perfect" life like she did his and then use/blackmail her to attack KJ.
Essentially, to kill with a borrowed knife or create a situation like "A mantis stalking a cicada is unaware of an oriole behind" by pitting KJ against FL's family then swooped in when KJ is at his lowest.
"I'm going to go all the way. Until I reach her end or mine."
I mean, why would his failure in taking revenge ON HER lead to his end? UNLESS...his plan A to use FL to take down KJ failed, she reached her end, which will then mean that SY needs to take KJ down personally as plan B. If he failed then it's his end.
Since the affair between the husband and sister is revealed, what if on the day of the child's death, they were having an affair, the sister ran away, the child followed her (to record a video for his mom), and she accidentally pushed him away towards Seonyul's dad's car (or Kim Jun's)? That's why the dad said "Why did he have to get hit by my car?"
It was an ACCIDENT and his dad still should have gotten harsher punishment for PURPOSELY delaying the kid's medical treatment (which is the primary reason that lead to the child's death) and for saying those unremorseful things to FL, but to KILL him out of anger and unremorsefully said she would do it all over again or that she didn't regret her revenge, ofc Seonyul will retaliate.
Two wrongs don't make a right and life for a life don't make it even. In the end, two lives are lost and two families are broken. One lost a child and one lost a father.
Now what if when Seonyul's investigated the accident, he found out about the cheating couple? In his perspective then it was them that lead to these tragedies. To be honest, what Seonyul did is so...small? Like yeah he sent pictures to destroy her family and happiness, but it was them first who betrayed her. He only revealed to her what is actually ALREADY happening. His revenge agendas seems stronger on Yuri with her estranged biological mom finding her again and with Suho with losing his wife, marriage, and nation's husband image. The cheating couple seems to have a lot more to lose due to his actions.
For now I still have no theories on Seonyul's mom's accident. Kim Jun might be the reason but why?
Her revenge vigilante justice had led to Seonyul and his mom becoming a collateral damage. In a way, she indirectly lead him to a worser fate than just being a murderer's son by leaving him without his dad's protection. Her life after prison seems to go back to "perfect" too despite the ever presence pain of losing a child. Her mom's restaurant was still doing well, her sister was now a CEO, and her now successful husband wanted her back. She even went on TV to talk about her experience and pain, so he must have felt that it's unfair that her killing his dad seemed to change nothing in her life but change everything in his life. So now he wanted to destroy that seemingly "perfect life" illusion with his own revenge vigilante "justice".
I think this drama is not about who is more likeable or unlikeable, or about whose side you are on, or who you can empathize and understand more. It's more about how revenge begets revenge.