The guitarist Top and the drummer Heff Holter continued as part of his backing band for several years.

"Heffy End" is essentially a sad love song where a woman obsessively stalks and confines her lover.

Although the title might indicate a bit of irony, and Seo justifies their deviated love from the norm by using purposely misspelled "Heffy".

"Robot" tells a story about a boy, or Seo himself, who is destroyed by the cruelty that exists in the current overly digitalized society.

The pensive lyrics tell the story of a man whose mind is flooded with memories of a lost love.

The song "lampoons Korea's highly commercial music industry" and Seo's "frustration with having to return to a dirty business that he left because of his doubts about it.

According to Seo, idol groups (aka "boybands") were born for the sole purpose of making profit out of music.

"0" is a symphonic rock piece that spans five minutes and thirty seconds, the longest song on the album.

Unlike the other songs, which follow a simple formula with guitar chords and a memorable melody line, 0 (Zero) consists of a noticeably more complex composition.

[3] Although South Korea's best-selling album of the year,[4] it did not match the heights of Seo's previous two.