Everyone has secrets they keep hidden, even from their loved ones. When Ouquan's wife gives birth to a child, Ouquan is certain the child is not his and suspects his wife of an affair. He discovers the other man is an unjustly imprisoned criminal, who is on the prowl for revenge and will stop at nothing to re-gain what he's lost.

故事发生在某大型海洋世界，卖鱼大叔牙叔（葛优 饰）、海豚训练员阿乐（岳云鹏 饰）和海洋馆保安杜治国（杜淳 饰）因工作结识，因境遇相怜。他们奋力挣扎，却最终遭受情感的挫折。这一晚，三人相约聚餐，借酒浇愁，在晕头转向、不省人事的时候，一辆汽车来到海洋馆。醉眼迷蒙的牙叔稀里糊涂在货单上签了字，第二天醒来却发现海洋馆的明星海豚宝宝被他卖到了国外。这桩意外顿时把三人的酒都吓醒了，而他们也成为盗售海豚的重要嫌疑人。
在此之后，他们匆匆忙忙踏上寻找海豚的征程，一路上更是闹出了无数的笑话……

Junhao declares to go to Sicily to learn opera and ends the relationship with his fiancée, Xiaoyou. In disbelief, she determines to learn the truth behind his sudden decision. Lee Joon-gi has teamed up with Lin for his first Chinese film.