Cha Ji-Won 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 to hide his identity. Through the bright persona of Swan, Cha Ji-Won falls in love and regains his trust of others.

• Lee Jin-wook
• Moon Chae-won
• Kim Kang-woo
• Song Jae-rim
• Yoo In-young
• Jeon Kuk-hwan
• Choi Jung-woo
• Lee Won-jong