Son Ho Jun, known simply as Ho Jun, is a South Korean singer and member of the group NTX. Victory Company originally called the group NT9 but decided to re-label as NTX, an abbreviation for "Neo Tracks No. X". They released their first pre-debut song titled "Black Hole" on August 2020 and then released 3 more singles before officially debuting on March 2021 with their 1st mini-album "Full of Lovescapes".
(Source: Korean = Namu Wiki || Translation = MyDramaList)