Jung Yunho,one of the most dangerous mafia leader,he never needed a bodyguard,but after an accident,his parents made him hire one, Kim Jaejoong,a bodyguard,cold never smiled before,like Yunho he is workaholic,What will happen when those two cold hearts meet each other??"Dont you play with fire you might get burn"  ForewordKim Jaejoong:23 years old,cold,never smile  Jung Yunho:27 years old,scary,heartless,mafia leader And other characters will show up later