Yang Li and He Yu grew up wearing a pair of pants.
Yang Li's dream is to guard a sunny classroom and teach a group of chirping children; He Yu's goal is to put on a firefighting suit and keep a safe place. They crossed their fingers in the summer when cicadas chirped, saying they wanted to see each other's wishes come true.
Later, Yang Li really became a teacher, and He Yu also became a firefighter as he wished. But the glory of the firefighting badge is always accompanied by danger. An unexpected mission made He Yu's figure stay in that place forever.
The chalk dust in the classroom is still floating, and the person who calls his name with a smile is no longer waiting outside the window. Those unspoken thoughts, together with the childhood promises, were buried in a long time.
Purpose: redemption