Yoo Ryeong becomes a policewoman in order to find her twin sister. She solve cases with her strong sense of justice and does not follow rules. This gets her into trouble. She partners with Go Ji-seok, who always fight with her over the cases. However, he ends up cleaning up after the problems caused by Yoo Ryung and holds the key to solving the cases.
After carving successful careers in their respective fields, the previous owners of Waikiki have left except for Lee Joon-ki. While he struggles with his career, he tries to revive the guest house which is now on the brink of bankruptcy with the help of some high-school friends.