Dex, also known as "Dex101" or "Kim Jinyoung" is a Youtuber/streamer and former ROK NAVY UDT/SEAL born on June 9th, 1995 in Suncheon, South Korea. He is working under a company called kthd. studio along with other UDT soldiers. His Youtube channel name is ??101 where he posts vlog content.