Zhang San is a social worker in an Internet company. People often ask him why he is called Zhang San.
Li Si is the fourth child in the family. When she was born, her parents were getting divorced, so they named her Li Si.
After Zhang San and Li Si got together, everyone they knew asked them if they wanted to give birth to a baby named Wang Wu.
Concept: Every little character has his own love story and is the protagonist in his own life.