人如其名的陈默默（杨丞琳 饰）是个存在感极其薄弱的人，比起社交更喜欢在家待着；比起谈恋爱，还是二次元的卡巴沙王子更帅气体贴。迷恋少女漫画里的异星球王子的默默是货真价实的宅女一枚。一直以来的平凡生活被突然来读大学的前当红偶像MARS（汪东城 饰）所打乱。学校要找人做MARS的向导，最后抽签的结果居然是默默。于是心不甘情不愿的默默和MARS的孽缘就此展开。本来还算相安无事的二人因为MARS随意把自己的签名签在了卡巴沙王子的脸上，让默默突然大爆发。就此结下梁子的二人本以为此后再也不见，没有想到阴差阳错，二人住在了一起。于是宅女和偶像男星的同居生活开始了。 一边是一直活在二次元里的卡巴沙王子的忠实追随者；一边是名义上在学校深造实际被雪藏的落魄偶像。二人会碰撞出什么样的火花呢？Superstar, Zhuang Jun Nan aka Mars (Jiro Wang), hits a low when negative publicity hits mainstream leaving him rock bottom and without a home. After his entire life is downsized, he returns to school and finds himself renting a room from his classmate, Momo Chen (Ranie Yang). Everything turns upside down for Momo when Mars enters her simple yet peaceful life. This agoraphobic homebody suddenly grows a backbone. Is love in the air for this pair from two different sides of the planet?
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