Cha Jung-Han (Oh Ji-Ho) is a detective for a special investigation team. He is busy with investigating violent cases including drugs and gangs, but one day he takes in his niece Eun-Ae and struggles to raise her.

Han Ye-Seul (Lee Soo-Kyung) is a single mother who raises her 5-years-old son alone. She is Cha Jung-Han’s first love.