Shim Bo Nui (Hwang Jung Eum) is very superstitious and does everything she can to ward off bad luck, from lighting candles to sprinkling salt. She has been visiting a fortuneteller for two years to find ways that she can keep her younger sister, who has been in a coma after a car accident, alive against all odds.
After another code-blue incident with her sister, Bo Nui begs her fortuneteller to keep her sister alive. The fortuneteller tells Bo Nui that she has to sleep with a man born in 1986 (the Year of the Tiger), or her sister will die. Bo Nui sets off on an earnest "man hunt" to find a man who was born in the Year of the Tiger.
When she realizes that Je Soo Ho (Ryu Jun Yeol), the CEO of a game development company, is just the man, she tries to pursue him. Meanwhile, Gary Choi (Lee Soo Hyuk) is a tennis star who moves in next door to Bo Nui because he used to have a crush on her as a boy and pretends to be 30 to get close to her.
Han Seol Hee (Lee Chun Ah), Gary's manager, can't understand his sudden interest in living in a small apartment and taking time off from tennis. Can Bo Nui find the right man and romance him for one night in time to save her sister?