Employees write letters to their bosses to express their inner grievances.

Hello, boss. I respect you very much. I work hard and do whatever you say. But you always look at me unhappily. You always make me do the dirtiest and most tiring work. I haven't got a good face yet. I feel like a prisoner. No rest, no leave, no pay, no telling anyone. I have complaints in my heart. Please forgive the boss.