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Kyeong-joon is driven out to the streets as he can't afford the rising rent. His girlfriend Ji-hye takes pity of him as he has nowhere to go and offers him to stay at her house. However, the woman who greets them at the door is his first love Ji-yeong! Ji-yeong taught Kyeong-joon about love and she was Ji-hye's step-mother. Living under the same roof, he feels something for her again while his girlfriend is also hot.
Young Se-hee gets married to middle aged Min-goo, but she's not happy with his 'item' as he's old. While she goes on vacation with her husband, Min-goo's daughter Yoo-jin calls her boyfriend Ji-hoon to the house when her parents are not there and they have sex. Meanwhile, Se-hee comes back home early from the vacation because her husband has to work and runs into a completely naked Ji-hoon.
The man was originally very loving with his girlfriend, and often did some exciting love, including in public places. However, when the man went to his girlfriend's house to see the future mother-in-law, things began to reverse, and the first rushed into it. The mother-in-law’s bathroom made the man’s heart yy, and all this has just begun, because the mother-in-law also discovered his huge genitals...