Oh Seong Joon, known simply as Sung Jun, is a South Korean singer, dancer and member of THE NEW SIX (더뉴식스, abbreviated as TNX). He attended Singal High School but dropped out and later passed the High School Graduation Qualification Examination. In 2021, he entered the SBS K-pop reality competition program "Loud", which was created by JYP Entertainment and P Nation to develop one group for each company. He was selected by Psy's P Nation (피네이션) and debuted in May 2022 as the group's vocalist and maknae with their first EP, "Way Up".

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