look guys I'll explain the yoohan is the main lead and yellow-haired guy was his past self and the actor is myeong shin but his stage name is song yoohan same as the main lead...yoohan was an arrogant thug in the past but because of his acts his family suffered now he can't forgive himself and working his a** off but now he listen myeong shin aka song yoohan that he send that guy to his brother to kill him...and flew away with his money he was a back stabber but this yoohan didn't knew this story but now that he know that his brother died because of him he want revenge GOT IT