Bom Yun is a shy and overworked high school ethics teacher who’s assigned to the most avoided class at Shinsu High School. The cause of its reputation is Jae-Gyu Seon, a confrontational guardian who terrifies the faculty. Yet as Bom gets to know him, she discovers a devoted uncle with an unexpectedly tender heart. Though Bom tries to keep her distance when Jae-Gyu openly pursues her, she soon finds herself hopelessly falling for this quirky but charming giant of a man.