Forty-nine-year-old Lin Qingsong hugs Ren with gratitude after receiving his accordion certificate.[Photo provided to China Daily]

Ren's first encounter with these blind people was about 20 years ago.

It was the day when Hong Kong was handed over to the motherland in 1997.

Then, Ren heard someone playing the accordion in Badachu Park in Beijing.

After listening for a while, he took the initiative and said to the blind person: "I can teach you."

Unconvinced, the blind person said, "Show me your skills first."

After Ren's perfect solo of the Spanish Bullfighter, the blind person could tell that he must be a master.

The blind person however did not take up Ren's offer.

Ten years later, at an accordion competition held in Beijing, Ren, who was a judge at the event, recognized the blind man Chen Guoyue.