I also noticed this and this is one of the reason why I'm sure that Yohan didn't kill Daniel Lee; the hood, and…
One thing is making me confused why Yo Han is afraid that he'd be accused of murdering if he hadn't killed anyone? And how Ba Reum got to know that Dr. Daniel was going to meet Yo Han? Maybe Ba Reum is the one who attacked Chi Kook and trying to put the accusation on Yo Han and rest of the murders are done by Yo Han or P.O!
It wasn't for you! This drama has a deep message. Don't rate low just because you don't like it. Obviously it's not a masterpiece but surely it's a healing drama