男主跟妻子本来愉快的生活在一起，却意外的招来了小姨子的留宿，小姨子插足的生活，让男主跟妻子的距离逐渐被拉远，碍于家里有个小姨子的原因，二人的性生活也不如原来频繁，而就在此时，小姨子却不断的对男主表达爱意，甚至不惜一切的勾引，男主能否在这对姐妹中做出正确的选择呢....

Haru, die wegliep omdat haar moeder haar betrapte terwijl ze seks had met haar vriend ,ze rent naar het huis van haar oudere zus Yu-hee . Yoo-hee woont samen met haar vriend In-gyu . Haru is verliefd op In-gyu, die een lerarenopleiding heeft gevolgd. Ze draagt nog steeds alleen In-gyu in haar hart ... Ze verleidt In-gyu en vraagt ​​hem om haar oudere zus, Yu-hee, te verleiden en seks met haar te hebben, enz. Maar kan het niet. De reden is dat haar pijnlijke verleden moet vergeten toen ze werd verkracht door haar leeftijdsgenoten op school. Wie zal In-gyu kiezen tussen Haru en Yu-hee...?

I want to steal them all! Haru, who ran away from her mother while having sex with her boyfriend (Jin Sang), runs away to her older sister Yu-hee's house and sits down. Yoo-hee also lives with her boyfriend In-gyu's house and lives together with her ... In fact, Haru has had a crush on In-gyu, who had been her teacher training since high school. She still has only In-gyu in her heart ... She seduces In-gyu from her older sister, and asks her to seduce her older sister, Yu-hee, to have sex with her, etc. can't act The reason her day is ending like this is to forget her painful past when she was gang-raped by her peers because her promises with In-gyu were mixed in high school. Who will In-gyu choose between Haru and Yu-hee...? Her sister's secret report, which seems to be her recklessness but bears her pain.

언니껀 모두다 뺏고 싶어! 남친(진상)과 섹스하다 엄마에게 들켜 가출한 하루는 언니 유희의 집으로 도망와 눌러 앉는다. 유희 역시 남친인 인규의 집에 얹혀살며 동거 생활 중인데... 사실 하루는 고등학생 때부터 교생 실습 나왔던 인규를 짝사랑 해왔다. 아직도 마음속에는 인규 밖에 없는 하루... 인규를 언니에게서 위해 온갖 유혹을 하고, 진상에게 언니인 유희를 꼬셔 섹스를 하라고 부탁도 하는 등 이해 할 수 없는 행동을 한다.

하루가 이렇게 막나가는 이유는 고등학교 때 인규와의 약속이 엇갈려 또래로부터 집단 성폭행을 당한 아픈 과거를 잊기 위해서다.

인규는 하루와 유희 두 자매 중에 누구를 선택하게 될까....?

막무가내로 보이지만 아픔을 간직한 여동생의 은밀한 보고서.