Hua Chenyu rearranged the song "Code Name: Contra" as an unplugged version, invited his best friend Zuo Li to play the guitar and sing in harmony for him. The original song is a song he wrote in 24hrs in another show "The NEXT S2", by using some soundtracks from "Contra", an old video game series published in 1987 by Konami. Hua Chenyu took the rap part off and composed new melodies for the verse.