Lin was born on August 24, 1995, in Haikou, Hainan and because of his parents' work, he grew up moving between Taiwan, Jiangxi, and Guangdong.
He passed the Hong Kong, Macau and Taiwan student entrance examination and entered Guangdong University of Foreign Studies.
He ranked fifth in the final episode with 12,131,367 votes and debuted as a member of temporary Chinese boy group Nine Percent on April 6, 2018.
Before the group's disbandment on October 6, 2019, Nine Percent released their second album 'More Than Forever' on September 26, 2019 where Lin Yanjun has a solo song "Like A Star".
[4] In Nine Percent's first debut anniversary, April 6, 2019, he released image teasers for his second personal music EP "Escape".