I believe this is the song that was released after he finished from the show "I am a Singer". There is a rumour that after you finish the show and get the popularity, that doesn't continue on to the album released right after the show. It is unfortunate how that is partially true. The song is beautiful but it seems like not many people know about it.
I found this song through a show called Magnificent Birth (위대한 탄생) and one of the mentee sang this song and I fell in love with it. I didn't used to like the style of Kim Jo Han, but after seeing his rearrangements of other songs in I am a Singer, I guess I kind of became a fan of him.