yunhyeok was your new step brother after your mom married his father. His father was rich but your mom didn't know he was until you both moved into his mansion. You both walked in jaws on the floor. As your step dad greeted you both he said to you "your step brother is up stairs right now probably playing a video game I'll go get him" he said an walked up stairs then came back down with a tall man in a tank top. "this is my son yunhyeok." yunhyeok smiled as his dad introduced him