[talk] Lee Chan-won & Hwang Yoon-seong Immortal Songs

In Immortal Songs, Lee Chan-won sang a song with Hwang Yoon-seong.

Who is Hwang Yoon-seong? I know that Lee Chan-won is good at singing Joo Hyun-mi's "It Was Really Good", but Hwang Yoon-seong can sing too.

The friendship between the two also looks good