不久前因父亲不幸事故去世的相宇带着妻子惠兰因担心和弟弟而搬回家住，却不料弟弟被惠兰深深迷住了，无法自拔，再加上惠兰最近与相宇的性爱并不令人满意，有一天，弟弟在和女友智恩做爱时，他竟然叫错了名字把女友当成了嫂子惠兰，智恩一气之下分手，绝望的弟弟回家后只能靠在春梦中与嫂子做爱，然而不久，他开始将梦慢慢变成了现实....

Ki-joon, die alleen woonde met zijn jongere broer Sang-woo, maakt zich zorgen over Hye-ran, de minnares van zijn vader die niet zo lang geleden bij een ongeluk om het leven kwam. Hye-ran kon nergens heen omdat de steun van hun vader was afgesneden. Ze had geen plannen om weg te gaan en Sang-woo vond haar leuk. Ondertussen is Hye-ran niet tevreden met haar seksuele relaties met Sang-woo en maakt ze zich zorgen over Ki-joon's geest.

Ki-joon, who lived alone with his younger brother Sang-woo, is worried about Hye-ran, who was the mistress of his father who died in an accident not long ago. Hye-ran had no place to go since their father’s support had been cut off. She had no plans to move away and Sang-woo is into her. Meanwhile, Hye-ran is not satisfied with her sexual relationships with Sang-woo and she is worried about Ki-joon’s mind.

동생 상우와 단둘이 살고 있던 기준은 얼마 전 사고로 사망한 아버지의 내연녀였던 혜란 때문에 걱정이다.