"Luck-Key" is a South Korean comedy film that tells the story of a man named Jae-Sung who accidentally switches bodies with a famous hitman named Tae-Sik. Jae-Sung is a struggling actor who is constantly down on his luck, while Tae-Sik is a skilled assassin with a dangerous reputation. As Jae-Sung tries to navigate his new life as a hitman, he must also deal with the consequences of Tae-Sik's actions. The film explores themes of identity, fate, and the importance of second chances. Will Jae-Sung be able to survive in this new world, or will his luck finally run out?