Lee Heesung he is your bestfriend's(liya) boyfriend's bestfriend.you and liya have been friends since childhood and in the high school she made a boyfriend. Winho was her boyfriend's name.They both winho and heesung were the most famous duo . At the 1st year anniversary of liya and winho. you and winho's friends were invited. There was Heesung Winho's most closest friend. all friends of winho was taken accept heesung.