Three men are thrown together by a toddler who comes out of nowhere, disrupting their already stressful lives. The loyal and kind-hearted Gao Han (Bosco Wong) has just lost his legal battle with his ex-wife for custody of their daughter. His ex-girlfriend and first love, Guan Lingling (Shirley Dai), who died in a car accident, has just sent her son to live with him.

Gao Han and his two tenants Wang Dongyang (Liu Guanxiang) and Yu Bo (Luo Yunxi) suddenly find themselves becoming nannies to a child, Dudu (Zou Zichen). Not only must they look after this little one, they must deal with an even bigger headache- Dudu's aunt Guan Shanshan (Kan Qingzi). While the three grown men busy themselves with raising Dudu, they try to determine the child’s paternity. They undergo a custody battle, as they deal with issues tied in with the return of Han's ex-wife’s Liu Min (Mai Hongmei). Han and Shanshan develop feelings for one an other. To complicate matters, Yu Bo also falls for Shanshan.

　　忠厚善良的高寒，在和前妻的争夺女儿抚养权的战争中失败，此时，因车祸丧生的同学关玲玲的儿子却被送到了自己家。无奈之下，因为一场与自己风马牛不相及的车祸，高寒同自己的两位房客汪东阳、于博各自努力，成了三个别具特色的奶爸；他们不仅要照顾孩子这个小麻烦，还要照顾嘟嘟的亲小姨关姗姗这个大麻烦。三人共同抚养孩子的同时，也努力找寻着嘟嘟的身世之谜。经历了孩子失而复得、前妻刘敏归来搅局、关珊珊破产风波、抚养权争夺等等一系列的囧事，高寒和关姗姗情愫渐生，而于博也对关姗姗情有独钟，一面是温柔大叔，另一面是冷面男神，最终高寒与关姗姗走到了一起。

Τρεις άντρες συγκεντρώνονται μαζί, από ένα μικρό παιδί που έρχεται από το πουθενά, αναστατώνοντας τις ήδη αγχώδεις ζωές τους.