Who is the rain in Mrs. Lin's house?

Ximen Qing's close friend and Mrs. Lin's lover. He used to be a scholar, but later he failed in the exam and became Ximen Qing's domestic servant.

Baidu Encyclopedia says that every rain in Mrs. Lin's house is a poem in Jin Ping Mei, which means that Mrs. Lin met someone who made her happy at home. Mrs. Lin is a female character in Jin Ping Mei. Her name is Lin Daiyu, the sixth concubine room in Ximen Qing, and Ximen Qing's favorite concubine room. Originally a widow, she was later adopted as a concubine by Ximen Qing and bought her a new yard to live in. Gan Yu is a male character in Jin Ping Mei. His name is Ganlu. He is Ximen Qing's confidant and Mrs. Lin's lover. He used to be a scholar, but later he failed in the exam and became Ximen Qing's domestic servant. The sixtieth episode of Jin Ping Mei tells the story of rain in Mrs. Lin's house. At that time, Ximen Qing was on a business trip to visit the Emperor Hui Zong in Beijing, and Mrs. Lin missed Ganlu because of loneliness. She sent someone to find Ganlu and let him sneak into another hospital. The two met and spent the night in each other's yard, and they were extremely happy. The next morning, Ganlu left in a hurry. This is the meaning of every rain in Mrs. Lin's house.