On the April 5 airing, a contestant with the title, 'Former YG Trainee Ha Dong Gyun', appeared on stage. The mystery singer claimed he got the nickname due to his voice that resembles singer Ha Dong Gyun. 

The actual singer Ha Dong Gyun, who was on the show as one of the panelists, made his guess on the identity of the mystery singer. 

Ha Dong Gyun said, "I don't think he's really YG color and I don't think they like voices like mine..."

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But to everyone's surprise, 'Former YG Trainee Ha Dong Gyun' revealed to be a true talent. The mystery singer revealed to be Lim Chan Woo who used to train under YG Entertainment. 

His deep voice and powerful vocals amazed the crowd. Lim Chan Woo commented, "My late parents told me to do the things I enjoy so I'll work hard on music. I will do good music and stand on stage with Ha Dong Gyun sunbaenim one day."

Check out Lim Chan Woo's stellar performance in the clip!