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.
as Cha Ji-won / Mr. Black
as Kim Swan
as Min Seon-jae
as Seo Woo-jin
as Yoon Ma-ri
as Baek Eun-do
as Seo Jin-tak
as Ko Sung-min
as Cha Jae-hwan
as Cha Ji-soo
as Kim Ji-ryoon
as Ahn Gye Dong [MRBI staff]
as Ha Jun
