Lee In Woo, known professionally as LEENU, is a South Korean singer, vocal trainer and guide vocalist. He graduated with a bachelor’s degree in Sociology from Suwon University. He made his debut in 2010 with the single "Sunshine Fellow #3" and he later appeared as a contestant in episode 7 of "I Can See Your Voice 3" and made it to the final singing a duet with guest Yoon Sang. He has released singles or OSTs since his debut but he hasn’t been able to find many opportunities to become well-known. In 2021, he got a major boost as he became the final winner of MBN’s singing competition show "Voice King".
(Source: Korean = Wikipedia || Translation = MyDramaList)