
Min-ji has had a crush on her brother-in-law who was her tutor for a long time. She seduces her brother-in-law, Jeong-hyeok, but he doesn't easily fall for it, so she takes special measures.
Cheating Notes

Note: The TMDB English title is incorrect. The Korean title's correct translation according to Google Translate is: My Wife's Pretty Sister. The two lead female characters are sisters, not mother and daughter. The subtitles and the synopsis of the movie also confirm this.
Min-ji is attracted to her brother-in-law who was her tutor for a long time. The first time she seduces him (13:18), they go as far as petting on the couch but he changes his mind and leaves her hanging. So she ups her seduction plan by purposely leaving her bedroom door open and letting her brother-in-law watch her have sex with her boyfriend (24:40). It works, and she and her brother-in-law have sex (34:14).
On the third time Min-ji and her brother-in-law have sex (53:49), his wife (her older sister) catches them in the act. She doesn't confront them though, instead, she talks to Min-ji's boyfriend and shows him their sex video.
The next time Min-ji and her brother-in-law have sex, the wife records them again but the movie ends abruptly, which leaves me disappointed since I wanted the wife to have revenge sex with her sister's boyfriend. I think the movie is unfinished and they just abandoned the progress between the wife and her sister's boyfriend because the two did have scenes together whose purpose seems to be to develop an affair between them (47:20).
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