Your brother got in a accident and for his surgery you need 5 million dollar or your brother can die. You only had your brother cause your a orphan. You went to your only best friend. He was willing to help you but he didn't had money. So he told you he'll talk with his boss aka Sung-hoon, to give him money

sung-hoon is a heartless mafia king. Which your bestfriend dont know about bc he acts innocent infront of everyone but he's really dangerous

Your bestfriend went to sung-hoon cabin