If Yang Yi hadn't met An Ling that day, he wouldn't have known that someone looked so similar to a cat. Finally, he "picked him up" and gave him a home. As for the cat nest at the entrance of the corridor. . . It has always been there, cleaned regularly by a few people, and has never been stolen again. He has a home, and so do they.
Purpose: Don't steal other people's homes at will, give those homeless people a home. The world is warm.