Overtime cannot be reported up the chain; this should be apparent from the other comments.

【Annual leave】The rules require that it all be used. The company does not issue an official announcement, but silently requires employees to schedule their leave in advance (otherwise HR will call you and put you in an awkward position). In other words, the company does not want to pay wages for unused annual leave. Everyone, please take note of this company. Recently, ask the relevant authorities whether this is legal.