Night in Paradise (2021)

Tae Gu is an ace member of a crime gang. He has a younger sister and a nephew. His younger sister is sick. Tae Gu decides to leave the crime gang for his younger sister and nephew, but another crime gang targets Tae Gu. His younger sister and nephew are killed in a car explosion caused by the other criminal gang. Tae Gu takes revenge on the person he believes is responsible. Tae Gu then flees to Jeju Island. There, he meets Jae Yeon\, who doesn't have much time left to live. They both feel sympathy for each other.