It was released on August 14, 2020, through SM Entertainment and Capitol Records, as the first pre-release single from the group's debut studio album, Super One, which was released on September 25, 2020.

[1] "100" was described as a track with a fast base line and dynamic rhythms that expresses SuperM's unique and powerful energy.

The song was composed by Mark, Harold "Alawn" Philippon, Andy Love, Jasmine Kara Khatib-nia, Ryan S. Jhun and Yoo Young-jin, with the arrangement was held by Alawn, Love and Yoo.

Critics have described it as an anthemic dubstep-inspired track with big, techno-style beats and an aggressive, thumping bass line that wraps around staccato-style raps and a slinky melody.

SuperM also performed the song on Music Station on August 21.