一场灭门惨案，让原本逍遥浪荡的关宏宇成了在逃的通缉嫌犯。身为刑侦支队队长的双胞胎哥哥关宏峰，誓要查出真相，但出于亲属回避的原则，警队禁止关宏峰参与灭门案的调查工作。关宏峰义愤辞职。调任了代支队长的周巡处于破案压力，也为了追寻关宏宇的下落，设计让离职的关宏峰以“编外顾问”的身份继续参与各大重案要案的调查。而警队所有人都被隐瞒了。由于罹患“黑暗恐惧症”，白天和黑夜出现在警队的“顾问关宏峰”，其实是由孪生兄弟二人白夜分饰，性格迥异的兄弟两人在警队中马脚不断，背负着随时被周巡及各路人马发现的危险，一路侦破了各种大案要案，目的只是想伺机调阅灭门案的案卷查出真相，以还清白……

A movie about the Spring Festival Gala, the homesickness and New Year customs of Chinese overseas. It records a group of Chinese who carefully prepared a Spring Festival Gala for their beliefs. However, there are many difficulties in the process of preparation. A series of funny stories have taken places.