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.
All In is a 2003 South Korean television drama series that aired on SBS from January 15 to April 3, 2003 on Wednesdays and Thursdays at 21:55 for 24 episodes. Inspired by the life of professional poker player Jimmy Cha, it starred Lee Byung-hun and Song Hye-kyo in a story about one's man's rise through the fiercely competitive world of casino gambling as he clashes with his rivals over money, success, and love.
The drama was a ratings success in South Korea, with its final episode reaching a peak viewership rating of 47.7%, which is the 42nd highest-rated Korean drama episode of all time. It also won several awards, notably the Grand Prize for Lee Byung-hun at the 2003 SBS Drama Awards.