Luck Key

Luck Key is a 2016 South Korean action comedy film directed by Lee Gae-byok, starring Yoo Hae-jin in the lead role. It is a remake of the 2012 Japanese comedy film Key of Life. Plot Jae-sung, an aspiring actor who has hit rock bottom, prepares to commit suicide. After his landlady insults him, he first cleans himself at a public sauna. Hyung-wook, a notorious assassin, cleans himself at the same sauna after killing a target. Hyung-wook slips on a soap Jae-sung accidentally drops and passes out. Remembering Hyung-wook's luxurious look, Jae-sung switches his locker key with Hyung-wook's and steals his car and money. Feeling guilty, Jae-sung later tries to return everything to Hyung-wook, who is recuperating in the emergency room. At the hospital, Jae-sung is startled, when Hyung-wook grabs him before Jae-sung is about to leave the belongings. Jae-sung finds that Hyung-wook does not remember anything due to a concussion, leaves without telling Hyung-wook anything. While Jae-sung enjoys Hyung-wook's money and fancy apartment, Hyung-wook struggles to remember his identity, assuming he is Jae-sung because of the locker key. Hyung-wook can not pay his hospital bill, so Lina, a paramedic, pays it for him after he promises to pay her back. When Hyung-wook realizes he is bankrupt, Lina finds him a job at her mom's small restaurant. With his amazing knife skills, Hyung-wook becomes the main chef, drawing many customers for the restaurant. He later finds a marked date on a calendar with a location and learns that he (Jae-sung in reality) is an actor who is supposed to appear in a gangster-themed TV show as an extra. Though he initially struggles as an actor, Hyung-wook excels in action scenes thanks to his real life skills. His role in the show becomes more significant with Lina's help as the show progresses. Hyung-wook and Lina also find themselves liking each other. Meantime in Hyung-wook's apartment, Jae-sung discovers a secret room and thinks that Hyung-wook is an undercover cop protecting a witness named Eun-joo, who lives in the same building. Jae-sung watches over her and, over time, falls in love with her.