Police inspector Jisoo Kim was moved to the heinous crime division to assist veteran Haein Jung on a series of mysterious deaths in Jeju. A psychotic serial killer on the loose and his target? A young couple who were expecting a new member of the family. His modus? Recording the young wife being molested in front of her husband before killing them both. A tragic family massacre. A pattern has been observed through profiling on where the killer looked for targets thus they identify the possible location the killer will strike next. The two were tasked to go undercover, living under one roof, being the young couple recently got married and expecting their first baby, to catch the murderer. Kim being a reckless officer and Jung a by the book, by the rules law enforcer, they will face one of the most dangerous job of their professional careers. A maniac serial killer and a scripted mission. As love blooms in the middle of danger.... Everything went detour. Highest Ranking: #1 in serialkilling #39 in serialkiller #34 in undercover #65 in police #2 in Snowdrop