beta
I still think revenge is not the main theme of this story, so it's save to say that the ending is rightfully Hawon's.
He learned that to get his happy ending he will need to use his body (as sad as that will be), and he accepts that painful truth without holding that as his only truth, I guess.
This is not incest and they are not brothers. It should be "hyung" as honorifc for someone who is older and close to you, not brother in sibling sense （￣へ￣）