Han Zhengxi (Zheng Zaiyong) is a man who doesn't like changes. No matter big or small things in life, Zhengxi will carefully record them in his schedule and strictly follow the schedule to live his life. In addition, Zhengxi also has a cleanliness that goes far beyond the normal scope. How to survive in this world full of bacteria and viruses has become Zhengxi's biggest issue. Zhengxi's fussy personality has caused him a lot of suffering, and the most worrying thing is the tragic fact that he is still single at an old age. By chance, Zhengxi met a girl named Li Zhiyuan (Han Zhimin). Zhiyuan's liveliness and cheerfulness attracted Zhengxi's attention, but what made Zhengxi crazy was that Zhiyuan in life turned out to be a careless and sloppy girl. The opposite personality did not extinguish the spark of love in Zhengxi's heart, and the love comedy with laughter and tears kicked off.