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Sang-min's girlfriend Eun-jeong, is a nude model and takes photos with a stranger in a motel naked. Sang-min who doesn't believe in free-spirited Eun-jeong, after drinking in three groups with her close friend Jae-hoon,, comes home. Sang-min, who noticed that Eun-jeong is quietly flirting with Jae-hoon, asks if he wants to do with Jae-hoon while having sex with Eun-jeong. When Eun-jeong actively responded, he made Jae-hoon go into the room where Eun-jeong was sleeping.