Lee Joon-gi
Lee Soo Hyun
Nam Sang-mi
Seo Ji Woo
Jung Kyung-ho
Kang Min Ki
Kim Kap-soo
Jung Hak Soo
Lee Ki-young
Kang Jung Ho
Jung Kyung-soon
Oh Seung Joo
Choi Ji-ho
Giraffe
Lee Tae-sung
Bae Sang Shik
Sung Ji-ru
Mr. Byun
Choi Jae-sung
Mao
Kim Jung-nan
Yoo Kyung-hwa
Cha Soo-yeon
Chao Ming
After his mother is brutally murdered by the Triad in Thailand, Soo-hyun is adopted by NIS agent Kang Joong-ho, and he grows up with Min-ki like brothers. Min-ki and Soo-hyun both become NIS agents later on. One fateful day, Soo-hyun meets Ji-woo after last seeing her in Thailand when he was a child. They start dating. One day, Soo-hyun ruins a mission when the suppressed memories of the day his mother died surfaces in his mind. NIS Director Jung gives Soo-hyun an undercover assignment to infiltrate the Triad and Soo-hyun takes the job. Soo-hyun fakes his death and assumes a new identity to become a member of the Triad. With his fake identity and new name, he prowls the back alleys of Bangkok.
