Swordsman in the Snow Season 2

Xu Fengnian, who had lived in seclusion in the mountains for many years, and his wives ate simple meals. Xu Fengnian smiled at Jiang Ni and said, "Little clay man, do you hate me, Jiang Ni?" He said with a smile, "I hate you, but slowly I fell in love with you. I am not ashamed anymore. After all, I am 54 years old this year." Xu Fengnian said, "Hey, I coughed a few times and looked at you with a white fox face." The white fox face said indifferently, "I don't regret it." Xu Fengnian coughed a few more times. The white fox face brought a cup of tea and said, "What's wrong with your health?" Xu Fengnian said, "I'm not as old as 30 years ago." After that, he walked out, you guys eat first, I went out to relax. Xu Fengnian walked out of the door. Suddenly, Xu Fengnian discovered a problem. Why is there an extra door here?