Cha Ji-Won (Lee Jin-Wook) is a UDT officer of the Navy Special Operations Force. He is positive and has personal charm, but he falls into a desperate situation due to a friend's betrayal. He goes through numerous life or death situations. Cha Ji-Won then enters into a fake marriage with Swan (Moon Chae-Won) to hide his identity. Through the bright persona of Swan, Cha Ji-Won falls in love and regains his trust of others.