Saipan Romance Sex Instinct.

The boss asks his wife to avoid Saipan, where he and the other members of the organization are, because her secret mistress is there. However, Min Ji falls in love with Sang Hoon, a member of the organization who was also there. The boss, who won't believe Min Ji, sends the killer to investigate the situation, and after the killer arrives in Saipan, he reports their movements to the boss one by one.