Moonstruck

It must have something to do with the English translation of that one scene (when the Doctor gave Heesungs files to Hyunsu and told him to slowly cut ties with people his son knows, something about army was mentioned too). I assumed realHS is already done with the mandatory military service before the car incident but given the overall circumstances it is most likely not. Maybe that is the reason they took him in.
If they let go of HyunSu, either he end up on jail or not, nothing suspicious will link to the Baek family (as far as we know that was a car accident). This would be a logical decision for them.

But then if HeeSung is already being called to start military service (he seem to be at the age for it), they would have problems answering for this. Idk exactly the mandatory services rules but
a) if they said he went abroad without showing up first to request postponement of duties, that will be technically deflecting
b) if they reveal he is on coma because of stabbing, they have to make up stories on what happened that night, additionally having a son in coma seems to be affecting the Doctor's position in the hospital (not that I fully get why)

This somehow makes sense to me as incident happened 2004 and then Jiwon (who then lives in the same area as the Baek) first time met Hyunsu on 2006. After 2 yrs which could be the time he went to the army.

So I kept on nagging about how Baek family took him in doesn't make sense, and because I love this drama so much my brain FINALLY came up with a logical theory. See spoilers below.

Exactly! haha initially I was thinking it is out of the parent's guilt for HyunSu's life tragedy, but seeing recent episodes that doesn't seem to be the case.
Obviously they are living a lowkey life with not many friends and relatives (nobody would really think it's suspicious if realHS went missing, then why did they suddenly decide that they need to replace him. What for? And specially why pick someone with ties to the serial killing. I don't get the rationale, their decision just seemed to create more complicated mess for them. It did not serve any logical purpose.

Any news if we'll also have episode 13 this week?

Done watching episode 12.
I still don't get it why Baek family took Hyunsu in. Okay I get that the Mother stabbed realHS, but why go thru all that trouble of replacing him. They could have simply said he went abroad and they rest of the world won't know that he's in coma and about the incident. Also they were doing their best to keep him alive meaning they are aware that any moment he'll wake up, what it he woke up just after a few months , how will they deal will HyunSu then. As much as I super loooove this drama, some parts don't make sense.
And yes, it is still stretch that real HS and Hyunsu crossed paths. And real HS suddenly walking and having strength after looking so weak previously.

The series is unpredictable so it's hars to tell. But I think it's leaning towards a happy ending. Hyunsoo might go into jail a few years or so then reunite with his family. I also think Moojin will play a big part in clearing his name to the public, thereafter he can live as Do Hyunsoo again.

Yes. The age difference is noticeable so I don't think there was a switch.
Even Jiwon told Hyunsoo that he looks young for his 'fake' age.

Random thought.
Real BHS is giving me Gumiho Lee Dong Wook vibes.

Episode 11. Production missed out putting wound marks on HyunSoo's hands. His hands looks perfectly okay in the next scenes even after bleeding alot from being tied up.
No big deal but that's just me being very attentive to this drama.lol
Can't wait for episode 12!

Yes. Moving on from the funeral scene, the night of the accident is now a key scene. We have the same questions, however I think I can answer about the hair color.
2002 - Don Min Seok funeral and the year Hyunsoo ran away. Yes, real Heesung hair is black and he does wear the wristband.

(2 year gap - he dyed his hair and did some volunteering in the hospital, hence the fotos in the internet)

2004 - is when real Heesung (with blonde hair) hit Hyunsoo.
HeeSung went into coma and HyunSoo assumed his identity and dyed his hair.

2006 - HyunSoo (still with blonde hair) met Jiwon.

from the funeral scene, looking back at how real Heesung cried over Do Min Seok, it seems maybe (just maybe) he sees him as some sort of father figure (remember the Doctor is an absentee father).
maybe on the 2 yr gap, since DMS died they tried to mend relationship with his father (doctor) and brought back some normality. The only thing I can think of now is that real HS is suffering from some sort of split personality disorder. That could explain why he acted that way when he hit Hyunsoo, and when he couldn't reach his Dad while panicking (again he let him down), he spiralled into his psycho self and maybe had the urge to kill Hyunsoo and the Mother saw this and knocked him out. But then again he could be just imagining that night, and maybe he did purposely went after HyunSoo anyway.

Regarding other people recognizing real HS picture, I don't think he introduced himself as the doctor's son in the volunteering. Remember from earlier scene, I think it was Moojin (I forgot who exactly) who search for Baek Hee Sung in the internet and the only thing that showed up is records from his youth about being a Math/academic wizard.

It seems like the Mother did something to him. I'm guessing he had a psycho moment (probably wanting to kill HyunSoo) and Mother knocked him down and he ended up in a coma. What's confusing though is how he reacted when he hit HyunSoo, he seemed very flustered and even want to take him to the hospital. Maybe this scene was a false memory or he has some sort of split personality disorder. It's also absurd how he coincidentally hit HyunSoo, it's too far fetched. I hope the writer has more revelation for that day. I want to believe HeeSung deliberately went after Hyunsoo.

agreed. these are they're real age. just add 1 yr for Korean age and it matches the one in the chart Sarah mentioned.

Sarah, this chart is released July before any of the show spoiler. The 39 yr old is Do HyunSu pretending to be Baek HeeSung (meaning real Baek Heesung is 39). HyunSoo cannot possibly be 39 as his noona (older sister is 37). HyunSoo's real age is 36, same as Moojin and one year younger than Jiwon. Btw, this are all korean age system.
Hope this clarifies :)

You won't get hate comments just by stating your opinion.

"Mc was supposed to be smart guy but how this guy doesn't even understand his wife's behaviour."
-As explained by others, he has a psychological illness where it is hard for him to empathize or understand emotion. It is not straightforward given in the drama but if you observe, there are many scenes that shows. Just in the beginning of ep 11, see how he reacted on seeing JW's reaction to the birth of their baby.

'He had stayed hidden for this many years then how he forgot about recorder in car. '
-He was quite smart on detecting that recorder and he actually deleted the contents. It was left in the old woman's house after Moojin got attacked there. It ended up in one of the detective's hand and he secretly recovered the files. This was all clearly shown in the episodes though.

'And now he's crying that his wife knew makes me laugh.'
-Don't take this negatively but I guess you have been missing what the character is about. Him crying is an important aspect to this story and also as a character development. Notice how he gets chest pain when he gets overwhelmed with 'emotions' which he cannot identify. He never cried even after the Mother went missing. This episode is him finally letting go and acknowledging that he has emotions and not the monster he thinks himself to be. Hence, also admission that he loves his wife.

"And the guy who's bedridden is the partner in killings but how the hell that guy is so young, did MC's father taught that real beak hee sung how to kill. "
-again there are clues here and there. Real HeeSung is older than Hyunsu. JW is even older than HyunSoo. In 2002, real Heesung is around 20-21, thus you see him driving and at the age that it can be believable that he kills people. Hyunsoo then was around 15-16.

This show is not to be taken just at face value. Sometimes I rewatch episodes and notice more details. If you read the director's notes there is even explanation on why their house is structured that way, or why the camera moves like this or that on certain scene.

The only thing that bugs me at the moment is the absurdity of 'coincindence' that HeeSung hit HyunSoo. But it seems there is more to that accident than what was revealed so far.

Yes. This bugs me a lot too. Initially I have preferred if the Baek family had nothing to do with HyunSoo's past to keep it more realistic. But since we are already here, I hope the writer can give us a satisfying explanation. So far they had been giving attention to details, characters are making logical decision (ex. I rolled my eyes when JW went running around after the criminals without a vest, but then they did a scene where they addressed this. Also explanation about the HyunSoo's and Moojin undercover device etc). Therefore I hope writer is sensible enough not to leave this too far fetched scenario of HeeSung accidentally hitting HyunSoo. It would take away the level of amazing this drama has so far been achieving.

We are definitely still missing some key information about that night of the accident. It's quite clear from the funeral that Hee Sung would go after the siblings. Maybe he had something to do with Nam Soo Kil stabbing HyunSoo? Maybe he's already on his way to take his corpse anyway? But then why would he be flustered when he hit him? He even offered to take him to the hospital and only HyunSoo insisted not to. Are these facts or just a version of HeeSungs memory. It's so confusing.

And obviously once they got home, he did something that forced his Mother to do something where he'd end up in a coma.

And the only explanation I can think of with the Baek family taking HS in is either because of guilt, or because they're worried HS being a wanted person end up in the police and the case gets reinvestigated.

Hyun Soo is much younger. He is even younger by one year than JiWon (yes, he's not her oppa in reality lol). If you observed on the earlier episode there is a scene where Moojin is said to be younger than JW, and based on flashback Moojin is same age as HyunSoo. Therefore on 2002, real Heesung is around 20-21 and HyunSoo is around 15-16.

Seems like the chest pain are not just panic attacks but repressed emotion. Although painful to watch (my heart breaks for him), it's a huge character development that he now cries. And boy he did cry a lot.

Yes. The truth is finally out between the two of them. JW saved HS and asked him to ran away where no one can find him. HS was overwhelmed with emotions (new for him) over the fact that JW knows and yet she didn't leave and moreso protecting him.
After a vey emotional scene they decided to face the situation together. They went home and the cop arrived the next morning. I would say very refreshing for a drama that they did not drag this and the misunderstanding between them was dealt maturely.
And most importantly, HyunSoo finally admitted that he does love Jiwon.

It's quite clear real BHS is psycho.
Do we trust his memories or version of the story? Did he really hit HyunSoo just by accident and not sought him? I have to rewatch that clip again now. It's been clear even during the funeral that he has interest on the siblings. I hope it is not just coincidence of him hitting HyunSoo (so it's more realistic).

And I still don't get why the Baek parents took HyunSoo in. They could just have let the world know the son died in accident or say the truth about the coma. It seemed like they entangled themselves more on the serial killing by taking DHS.
Did they take pity on HyunSoo for what he suffered because of their son? Or are they worried HyunSoo might end up in the police and the case gets reinvestigated?

EPISODE 11 SPOILER.
THE TRUTH IS FINALLY OUT.
QUESTION ABOUT BAEK HEESUNG