Wooseok X Kuanlin (우석X관린) is a South Korean musical duo formed by Cube Entertainment in 2019, composed of Wooseok of Pentagon and Lai Kuan-lin, a former member of Wanna One. On February 20, 2019, Cube Entertainment announced the formation of a new group project featuring Lai alongside Wooseok. The duo debuted on March 11 of the same year with 9801, featuring title song "I'm a Star".