Kim Je-Ha is former solider for hire. He is also called K2. He is hired as a bodyguard by Choi Yoo-Jin. Choi Yoo-Jin is the wife of a presidential candidate and the daughter from a chaebol family. Meanwhile, Ko An-Na is the secret daughter of the presidential hopeful. She is also a recluse.

• The K2
• Kwak Jung-Hwan
• Ji Chang-Wook
• Yoona
• Song Yoon-A
• Cho Seong-Ha