Red Vacance Black Wedding 2 (2013)

Hong-chae has never had a relationship and is frustrated with a man who has been a daily presence at her flower shop for two years. Feeling intimidated by his obsessive behavior, she tells him she has a fiancé and asks him to stop bothering her coworker, Hae-wook. He responds by stabbing her and fleeing. A year later, Hong-chae is living a normal life, with no memory of Jeom-dong, when they unexpectedly meet again. He approaches her through her mother, Seon-ae, posing as her boyfriend and displaying increasingly desperate and violent affection towards them both.