Is it realistic that there are four restaurants under Zhengyangmen?

No, the four restaurants under Zhengyangmen are: tea fragrance, drinking, gathering friends and going back to the building. There is no such restaurant in real life. Hero, his master Guan and three good friends in Beijing used four teacups, each representing a person. Han Chunming collected these four teacups and named his four restaurants with these four names.