In "Family with Children", Liu Xing found a master, but he was actually pretending to open a bathhouse. It was Episode 77 of the first part. Episode 77: Making Friends Accidentally

Liu Xing Chuan I bought a pair of weird homemade "beggar jeans" to go to school. I wanted to show off in front of my classmates, but a few senior boys "borrowed" the pants and I went home in embarrassment wearing the pants. Liu Xing wanted his pants back. By chance, he met Huang Feihong, the master of "Yixiaotang", who helped him get his pants back. As a result, Liu Xing almost became a Jianghu person. Xia Donghai saw the flaw and decided to step forward to save his son.