雪伦（文章 饰）和丹丹（刘芸 饰）是一对儿80后的小夫妻，雪伦婚后为创业急需资金，丹丹将母亲为他们在北京购买的婚房出售，资助雪伦，夫妻俩租住了四合院中的小平房暂时栖身。春节将至，雪伦远在黑龙江的父亲（张丰毅 饰）母亲（丛珊 饰）决意来北京和儿子一起过年，而丹丹在云南的母亲（蔡明 饰）一家恰巧也决定赴京度春节。因为丹丹当初瞒着母亲将房子出售，此时只好向现在的房主借住数日，以期向母亲隐瞒自己赞助雪伦的事实。双方的家长先后抵京，小夫妻总算瞒天过海隐藏了真相，然而这几位家长此次来京并非只为儿女，他们各有私事需要处理，在这个热闹的年关引发了诸多喜剧……

在零下四十度极寒之地，以周鹏（梁家辉 饰）、汪豪（佟大为 饰）为首的“追凶者”深入冰河，追查真凶寻找真相。在暗藏杀机的冷酷冰河，牵一发而动全身，每一个人都无法避免地被卷入一场场错综复杂的事件，成为“追凶”成员。而冰河下的最终真相却颠覆所有人的想象……

Lin Tianjiao is the top girl in her school. During one of her tests, she resorted to copying from notes, and is spotted by Gao Xiang, who is considered a wayward student. When the note was discovered by the teacher, Gao Xiang chooses to claim responsibility for trying to cheat. Lin Tianjiao feels apologetic towards Gao Xiang, and begins their friendship. Meanwhile, Lin Tianjiao's good friend, Lu Tiantian is courting Ou Xiaoyang. However, due to his poor academic standing, Lin Tianjiao ignores him completely. Classmate Huang Tao is secretly in love with Lin Tianjiao, but is too shy to express it. As a result, he and his best buddy, Li Tao are at loggerheads with Gao Xiang.