Hotel Iris (2021)
A chick begins a sadomasochistic relationship with a mysterious translator and cheats on him with his shy nephew.
Actors: Lee Kang-sheng
The Tenants Downstairs (2016)
Miss Chen is the mistress of her boss. She cheats on him with a younger, handsome guy and a fellow tenant in her building who hid in her closet and saw her screwing the young guy.