A reverse comedy that tells the story of a perfectionist assassin who falls and hits his head in a sauna, giving him amnesia. When a down-and-out actor switches locker keys with him, they switch lives until the hit-man, who soon becomes an action hero on TV, starts to remember things.

During the 1970s, in Kunchon, there were women divers who were able to dive without equipment, including two best friends Choon-ja and Jin-sook, Jin-sook's brother and Hammer. They always collected seafood under water for living. But, as fewer factories started to be built near the beach, the women divers started to have trouble with what they were doing for living. Without any choice, the ship crews decided to join the smuggling business in the water to seek a way for their living. But the smuggling business in their village got too big for Jin-sook's family to handle and the peaceful village was gradually broken.

In a small rural town, Joo Se-jong sells bootleg alcohol with his two younger brothers. Thing is, someone has died after drinking their liquor, so they must take back the hooch they’ve brewed and sent to the town of Hwaseong, before another person perishes from it. While on a mission to retrieve their deadly booze, they come across two dangerous and homicidal cultists who are terrorizing the villagers. Now, they must also fight for their survival and go up against the murderous duo.