In the past 38 years, Gao Jijie has helped 3,530 people find the right partner and he has never charged anyone for the work he did.

"In 1980s, I noticed that lots of my colleagues didn't have boyfriend or girlfriend although they had reached marriage age because they were working out of station," said Gao, 67, a retired railway worker in Harbin, capital city of Heilongjiang province. "So I began my second job of introducing potential boyfriends or girlfriends to my colleagues."

After retirement in 2006, he became a full-time matchmaker at a 30-square-meter office, which also doubles as his home.