Song Zhengguang's mother wipes her son's tears in Huaiyang county, Central China's Henan province, Jan 1, 2014. [Photo/CFP]

While Song was in detention from 2007 to 2013, his parents repeatedly petitioned the local government and judicial bodies because they thought the judgment was wrong.

Song, now 25, is working at a factory in Guangdong province. "I don't know whether I will be named as a suspect in the case, because the court did not announce my innocence," he said.