Fuzhou and Naha (the capital of Okinawa) became sister cities in 1981 and the cemetery was built five years later.

Chen's father volunteered to guard the cemetery first. After he passed away in 2004, Chen inherited the work because he lived nearby.

Every year, two or three groups of Ryukyu descendants visit the cemetery to honor their ancestors. College students also visit the place. Chen cleans the cemetery and burns incense and candles in preparation for visitors.

"Chen's unwavering dedication, even when the tombs were forgotten, is deeply admirable," said Lai Zhengwei, a professor from Fujian Normal University.

For Chen, the mission is simple: "I'll do what I can, for as long as I can," he said.