[4] He registered at an applied music hagwon's hobby class before taking the entrance exam for the professional department, which he failed.

Participants entered as the name of their place of residence and were evaluated by a judge panel from the contender's voice only; Song used the name Hwigyeong-dong.

[1] A showcase was held at COEX Convention & Exhibition Center on June 3 where Song was revealed as the winner; he released his debut single "Reason" on the same day.

[1] He launched an event alongside its release in which three couples to wed amidst the ongoing COVID-19 pandemic would be selected to win a free congratulatory performance by Song.

[16] "I Will Be Your Shining Star" ultimately peaked at number nine of South Korea's weekly national Circle Digital Chart.

[18] The following January, he appeared on the music competition series Immortal Songs: Singing the Legend with Lee Jung and they sang a cover of "One's Way Back" by Pak Sun-zoo [ko].

[4] Writing for entertainment website Xportsnews, Kim Ye-na took note of his ability to bring listeners to tears through the sentiments expressed in his breakup ballads.

[23] Song cites Naul of Brown Eyed Seoul and Jung Key as his role models for singing and songwriting, respectively.

[22] On New Year's Day in 2020, Song and ten of his fans visited the foster care facility Sunduk Home in Seoul, where they provided snacks, played with the children, and cleaned the premises.