The Assassin (Korean: 살수; Hanja: 殺手; RR: Salsu) is a 2023 South Korean historical action-drama film written and directed by Kwak Jeong-deok.

Starring Shin Hyun-joon, Lee Moon-sik, and Kim Min-kyung, the film depicts story of Lee Nan, Joseon's best swordsman, in front of an irreversible fate in a world of chaos.

Shin Hyun-joon was cast in leading role of Lee Nan, the best salsu in Joseon, along with Lee Moon-shik, Kim Min-kyung, Hong Eun-ki, Choi Seong-won, Kim Byeong-chun, Park Jae-hoon, and Kim Je-yeol in supporting roles.

[4] Later in November 2021, Lee Jung-min joined the cast in the role of Yawol, a hypnotic killer.

As of February 25, 2023[update], with gross of US$25,282 and 3,593 admissions, it is at the 31st place among the South Korean films released in 2023.