"Unexpectedness" depicts the unpredictable and legendary story of the ultimate loser, Wang Dachui, in an exaggerated and humorous style.

Wang Dachui was a beloved barber. He lived a peaceful and happy life with his wife Xiaomei and his master, until one day their home was reduced to ruins. The Four Heavenly Kings of the barber world—Eastern Green Dragon Shaving, Western White Tiger Blowing, Southern Vermilion Bird Perming, and Northern Black Tortoise Washing—arrived from the outside world, carrying four divine artifacts. To restore order to the barber world, they destroyed Dachui and his master's barbershop and kidnapped Xiaomei. Thus began Dachui's long journey of fighting monsters and searching for his wife.

The movie tells the story of Bai Sheng (by Deng Chao), a veteran employee of an Internet company who is forced into a workplace fiasco and decides to join forces with others to break the ice in order to defend his rights, only to be caught up in an even bigger whirlpool of mystery.

During the Republican era, a group of frustrated people from the movie industry is invited in a luxurious mansion to make a movie out of a gruesome case that has recently rattled the city of Shanghai, in the hopes that it would turn into a huge sensation and make them famous. However, they never expected that the murderer would be in their midst and that the truth behind the case would be far more bizarre than their fictional movie plot.