Well yea the lil bro made a mistake but in the end he himself was the one paying for it while Dowun still took an advantage of him, his father turns out to be a caring father at least for both of his sons.
Dowun needs to go down, or maybe will go down someday, with that attitude everyone will start to turn against him, Lyon, his lil bro, maybe his father as well and the hypocrisy of him, he didn't care Lyon loves someone else but wants to get rid of Baek Han instead of giving him facility or business solution to the rumors as Lyon's target of love lol, what a pain in the ass guy he is. I don't see how he and Lyon will work out, i see nothing but a toxic relationship.