A 23 years old boy (Jeon Jungkook) who is known to be dangerous and cruel mafia, the one who kills his enemy mercilessly, people and other mafia groups who are afraid of him A 20 years old girl (Park Y/n) who is innocent and claim to be orphan but in reality she is searching for her lost brother who left her at the age of 10 What if this dangerous cruel mafia meets innocent girl? Will the love blossom or not?