Description：Reiji Kikukawa (Toma Ikuta) is a perennial loser who has set a new record for the worst grades since the founding of the police academy and writes self-criticisms as a daily routine. He is a little bit lustful but straightforward and enthusiastic. One day he was appointed as an undercover mole. According to the order, he infiltrated the most terrible underworld organization in Japan and set a goal to capture the leader, Hong Zhoubao. This time he came to a luxury cruise ship called Sea Paradise, intending to stop a drug deal worth 600 billion yen. And his opponent is the eldest son of the big boss, Rexiong! ! ! He was framed by the mysterious beauty Shamon, and his relationship with his girlfriend Junna was in jeopardy! Can he overcome the crisis, capture Hong Zhoubao, and become the king of undercover? What kind of story will happen between him and his good brother Crazy Butterfly?