Lee Jae Jun (이재준) is a South Korean singer under Think Entertainment. He is currently a member of the boy group TAN.
He first debuted in July 2012 as a member of the boy group C-Clown using the stage name Maru. Following C-Clown's disbandment, he continued to train and eventually joined the survival show "MIXNINE." After this, he made another debut as a member of the now-disbanded boy group TREI. In 2021, he became a member of the duo JT&MARCUS under MLD Entertainment. In the same year, he participated in the survival show "Wild Idol" where he finished fifth place, making him qualified to debut as a member of the group T.A.N.