Main •
Jang Hyuk as Kwon Do-hoon (43 yo): Kang Yu-ra's husband, who is a black agent of the
National Intelligence Service who disguises himself as an employee of a trading company. •
Jang Na-ra as Kang Yu-ra (37 yo): Do-hoon's wife who dreams of a normal yet perfect family. •
Chae Jung-an as Oh Chun-ryun (43 yo): a professional NIS operative who is also Do-hoon's manager in the trading company. •
Kim Nam-hee as Cho Tae-gu (39 yo): a suspicious uninvited guest who visits the families of Do-hoon and Yu-ra.
Supporting Do-hoon's family •
Lee Soon-jae as Kwon Woong-soo (80 yo): Do-hoon's father. •
Kim Kang-min as Kwon Ji-hoon (28 yo): Do-hoon's younger brother. •
Yoon Sang-jeong as Lee Mi-rim (26 yo): Ji-hoon's wife.
Do-hoon's colleagues • Lee Joo-won as Lim Jae-yeol (43 yo): Do-hoon's colleague and friend, who is also a black agent. •
Lee Chae-young as Yoon Chae-ri (36 yo): Jae-yeol's ex-wife. She has excellent foreign language skills, as well as skills in information collection and espionage work. •
Lee Mi-sook as Ma Yeon-rim, Butterfly
Special appearances •
Cha Tae-hyun as Mr Cha, bakery shop owner •
Choo Sung-hoon as Koo In-bo •
Lee Ju-myoung as Shadow •
Choi Young-joon as Musa ==Production==