Du Zeming, a technical secondary school student majoring in hotel management, had an internship experience in his third year of high school. Under the leadership of his master Sun Yuan, he mastered the skills of guest room work and learned how to work in a hotel guest room. During the internship, he saw all kinds of people in the hotel, kind colleagues, difficult guests, the life of leaders, etc. He experienced the hardships of hotel service staff. He also witnessed all kinds of strange stories in the Huage Hotel and saw a different life until the end of the internship. There are different surprises behind the door of each guest room. Everyone has their own different story. Why do you always stay in the hotel? Why did you come to the hotel? Different lives write different anecdotes, including happiness, joy, sadness, and pain. The protagonist Du Zeming witnessed the TV dramas staged in hotels in modern society. Stories about mistresses, cheating, domestic violence, and pyramid schemes abound. The intrigues in the workplace also made him disappointed with life outside of school. He finally understood that a person's moral bottom line is the least worth mentioning. As long as you have money, all problems in life will not be a problem.