"Sogyeokdong" "Sogyeokdong" (), produced in secret collaboration with South Korean singer-songwriter
IU, is a pre-release single for the album
Quiet Night. It became Seo's first song ever to be pre-released online since his debut. The collaborative single featuring IU's vocals over Seo Taiji's composition, was unveiled on October 2, 2014 (by IU's record label
LOEN Entertainment), while Seo's solo version was released eight days later. The title of the track,
Sogyeok-dong,
Jongno-gu in
Seoul, is where the singer was born and spent his early years. According to Seo's agency, the singer planned this collaboration project under the theme of a sad and beautiful story which happened in Sogyeok-dong of 1980s, from the standpoints of a woman and a man, through two different versions of songs and
music videos. The '80s-themed music videos, both directed by South Korean
music video director Hwang Soo-ah, featured child actors popularized through television series;
Sung Yu-bin (''
It's Okay, That's Love) and Kim Hyun-soo (My Love from the Star''). The director's cuts of the videos also were released. The song reached numbers four (IU's version) and seventeen (Seo's version) on the
Gaon Singles Chart, respectively. Without any televised promotions, IU's version won the first place on the October 19, 2014, broadcast of
SBS's
The Music Trend. As of 2014, "Sogyeokdong" has sold approximately 830,000 digital downloads nationally, with the sales of both versions combined.
Superstar K6 winner
Kwak Jin-eon covered the song on the show's broadcast of October 24, 2014.
"Christmalo.win" "Christmalo.win" () is the
lead single from the album. The title of the song is a compound word of Christmas and
Halloween, and the track came out four days prior to the album's release. Inspired from
Christmas song "
Santa Claus Is Coming to Town", the single depicts modern people without division between virtue and vice, twisting stereotypical roles between
Santa Claus and Halloween monsters, through the lyrics of the song, "I just got bigger and became Santa / From the cradle to the grave / I'm a slave to comfort but a sweet cake / They say I have dirty specs, cut off from the list / What do you think about my new policy that I worked on all night?" The theatrical version of its music video features child actresses Ellie (whose voice can be heard at the end of the song) and Kim Soo-hyun, and actor
Shin Seung-hwan. "Christmalo.win" peaked at number seven on the Gaon Singles Chart, and has sold about 210,000 digital downloads since its release. ==Promotion==