32岁的张震东总觉得人生到了瓶颈。一晚，自称是12岁，穿越时空的他出现在家门口。小震东的出现把他的生活搞得乱七八糟，震东既要学会怎么照顾一个小孩，也必须保护小震东的真实身份。二人在途中必须更了解彼此，好让他们找到穿梭时空的办法，把小震东送回准确的时空，同事间阻止改变震东命运的那一天

Zhang Zhendong gets a knock on his door from his 12-year-old self from the past. His life is thrown into complete chaos as he struggles to play parent and hides the identity of his mini me from his neighbours. He fumbles on a journey of self-discovery and second chances as he attempts to fight for love and youth that he's lost along the way whilst figuring a way to send his mini me back to 1999.