Hwang Chi-yeul ( 황치열 born 3 December 1982).
In 2007, he made his official debut, releasing two albums and appearing in some TV and radio shows for about a year, but his career came to a halt because his management company closed.

He spent his twenties working part-time jobs and taught at music schools as a vocal coach, teaching idol bands including Infinite, After School, Lovelyz, NU'EST, and Hello Venus.

Since he appeared on I Can See Your Voice on Mnet in 2015, he has been one of the most active Korean celebrities as singer, host of TV-shows and awards, guest on various TV-shows, advertising model, brand ambassador.