莎拉是一个充满魅力和活力的女人，她擅长于投资“短线”爱情，将感情的期限定为一个月。这样的生活让她感觉自由自在，没有了长久感情的束缚，但也因此错过了许多真挚的情感。尼尔森，一个广告商，过着枯燥乏味的生活，工作繁忙却缺乏快乐

一个偶然的机会，尼尔森与莎拉相遇了。莎拉被尼尔森深深吸引，主动向他提出一个大胆的建议：成为“一个月情人”，在这短暂的时光里享受彼此的陪伴和温暖。尼尔森惊讶于这样奇特的建议，但心中对生活的渴望使他最终接受了这个挑战。

开始的日子里，尼尔森和莎拉就像一对恋人般相处，他的生活也逐渐被阳光所温暖。莎拉热情奔放的个性让尼尔森重新找回了对生活的热爱，而尼尔森的细心和包容也让莎拉感受到了久违的关怀。

然而，命运的捉弄往往来得匆忙。随着时间的推移，他们的分离日子越来越近。尼尔森开始感到不舍，他不想就这样失去莎拉。在这个时刻，莎拉的一个重大秘密被揭开，原来她之所以选择“一个月情人”，是因为她患有一种罕见的绝症，生命只剩下短暂的时间。

Sarah is a charming and energetic woman, she is good at investing in "short-term" love, and the duration of the relationship is limited to one month. This kind of life made her feel free and free from the shackles of long-term relationships, but it also missed many sincere emotions. Nielsen, an advertiser, leads a dull life, busy with work but lack of happiness

Nelson and Sarah met by chance. Sarah was deeply attracted by Nelson, and took the initiative to make a bold proposal to him: become a "lover for a month", and enjoy each other's company and warmth during this short time. Nelson was amazed at such an outlandish suggestion, but his desire for life led him to accept the challenge.

In the first days, Nelson and Sarah got along like a pair of lovers, and his life was gradually warmed by sunshine. Sarah's passionate personality allowed Nelson to regain her love for life, and Nelson's care and tolerance also made Sarah feel the long-lost care.

However, the tricks of fate often come in a hurry. As time goes by, their separation day is getting closer and closer. Nelson began to feel sad, he didn't want to lose Sarah just like that. At this moment, a major secret of Sarah was revealed. It turned out that the reason why she chose "One-Month Lover" was because she suffered from a rare terminal illness and had only a short life left.