On the May 4 episode, Highlight joined as the guest and gave a shot in finding the talented singers. Among the contestants was a young duo who claimed they're talented artists from 'Voice Kids'.
While in the debate about their identity, Yoseob commented that he thinks one of them was his student on 'Voice Kids'. It turned out that Yoseob was correct because one of them is Sa Kang-- the singer Yoseob taught on the past show!
Watch Yoseob and Sa Kang's reunion and their amazing performance together in the clip!