There is a scene mentioned in the Water Margin, that is, punching the town of Kansai. At that time, in order to avenge Kim's father and daughter, he punched Kansai Town. The daughter of the Kim family was forced to marry home by Kansai Town and then abandoned. After Lu saved him, one day he happened to meet the father and daughter of the Kim family. The two of them are living very well now, and the woman is married to Mr. Zhao and living very well.
To show his gratitude, Mr. Zhao invited Lu to his house to drink and eat meat. Lu lived in his house for a few days, and several people spread some gossip to let Mr. Zhao know that Lu was here because he killed the town of Kansai and escaped the arrest of officers and men. But because Lu wanted to help his wife, Mr. Zhao thought of a way. Because Lu is their benefactor, Mr Zhao is here. Lu is also a reasonable person. He only said that there is a peaceful place and he can do anything. Mr. Zhao suggested that there is a mountain more than 30 kilometers away from here, and there is a Wenshuyuan on that mountain. When we enter the Wenshuyuan, we can get the care of our elders, and our ancestors once spent a lot of money in the temple, so the Wenshuyuan will definitely take Lu in.
In order to let the people in the Wenshuyuan take Lu in, they need to do something for the Wenshuyuan, so Mr. Zhao renovated the Wenshuyuan, in order to let the elders and people in the Wenshuyuan leave Lu, and also to protect Lu's life and prevent him from being caught by the government. This is the purpose of Mr Zhao's return to Wen Shu College.
To sum up, the above story only represents my personal opinion. Please forgive me if there is any mistake.