As they live together, the professional boundaries between Min-woo and Mika blur. The situation is further complicated by Min-woo's assistant,

Based on the details provided, you are likely looking at the Korean film (also released as Housekeeper: My Wife’s Friend

While it may not have the mainstream recognition of a Bong Joon-ho or Park Chan-wook film, Housekeeper: My Wife's Friend (2019) occupies a specific niche in the Korean entertainment export market. It remains a frequently searched title for fans of the adult melodrama genre who appreciate the specific pacing and visual style of K-dramas applied to more mature themes.