时装设计师秀妍（首尔孝珠）是一个充满魅力和性感的女人，一直专注于工作，对婚姻并不在意。然而，有一天，她提出与男友太坪（Baek GEON植）签订一个共同生活的合同。在这份合同中，他们约定每周只能在一起共度一次夜晚。这个看似特别的协议让秀妍感觉自己能够保持独立和自由，同时享受爱情的滋味

然而，命运却开始对秀妍开起了一场玩笑。她的前男友允民宇，一个富有的财阀，突然出现在她的生活中，并表示希望能够重新开始与她的关系。秀妍内心深处隐藏着一个秘密，那就是她与太坪和允民宇两人之间的交往。

太坪很快察觉到了问题的存在，因为秀妍开始晚归并拒绝对他展示爱意。他开始怀疑秀妍是否对他真心，是否还与允民宇保持联系。太坪开始感到困惑和失落，他开始思考自己在这段关系中缺少了什么。

与此同时，秀妍也陷入了痛苦的抉择之中。她深爱着太坪，但对于允民宇的复出，她也感到心动。她开始反思自己的内心需求，思考着什么才是她真正需要的。

Fashion designer Soo-yeon (Seoul Hyo-joo) is a charming and sexy woman who has been focusing on her work and doesn't care about marriage. However, one day, she proposes to sign a contract of living together with her boyfriend Tae-pyeong (Baek Geon-sik). In this contract, they agreed that they could spend one night together only once a week. This seemingly special agreement makes Xiuyan feel that she can maintain her independence and freedom while enjoying the taste of love

However, fate began to play a trick on Xiuyan. Her ex-boyfriend Yoon Min-woo, a wealthy chaebol, suddenly appeared in her life and expressed his desire to restart the relationship with her. Soo-yeon hides a secret deep in her heart, that is her relationship with Tae-pyeong and Yoon-min-woo.

Tae Ping quickly sensed the problem because Soo Yeon started coming home late and refused to show him affection. He began to wonder if Soo-yeon was sincere to him and if she was still in touch with Yoon Min-woo. Tai Ping starts to feel confused and lost, he starts to think about what he is missing in this relationship.

At the same time, Xiuyan was also caught in a painful choice. She loves Taiping deeply, but she is also moved by Yun Minyu's comeback. She began to reflect on her inner needs, thinking about what she really needed.