On 6 December 2017 Lamar, together with the other members of Now United, released "Summer in the City", a preview single.
[4] After his debut in April 2018, Lamar became inactive in the group, returning to small activities, such as performances near England.
In June 2019, Lamar returned to the activities of Now United during the filming of "Crazy Stupid Silly Love",[6] and soon recorded the final version of "Like That".
[9] In 2020, in the quarantine season, Lamar has been doing Take Overs on Now United's Instagram account, participating in video clips and collaborative lives.
[10][11] On 22 November 2020, the singer Southside Diddy released "Roccstar Disappointments" featuring Lamar.