There are five lonely souls: Je-hwi, who hides himself from the world. Jang-hui, who is obsessed with certificates of qualification; Byeong-cheol, who believes that he has a fatal disease; and the lovers, Pyo and Romi. One day, a woman who committed suicide suddenly appears before them.
Is Who's That Knocking At My Door? on Netflix? Unfortunately the movie Who's That Knocking At My Door? is not yet available on Netflix.
| Directing | Yang Hae-hun | Director |
| Writing | Yang Hae-hun | Writer |