Dong Weiwei hotel waiter directly as the lobby manager is which episode?

In episode 12 of the TV series "Happy Gate". The heroine in the play is not Dong Weiwei, but Tian Xiaomei. Dong Weiwei is a gentle seducer and sales girl.

Tian Xiaomei went to the city to apply for a job, saying that she could bear hardships, as long as she stayed in the city, but because of her low education and no work experience, she ran into a wall everywhere. Later, I got a job as a hotel cleaner. Because she is conscientious, patient, not greedy for petty advantages, and occasionally serves the hotel owner. Because of her thoughtful service, she was appreciated by her boss and eventually promoted to lobby manager.