Pupil is a Filipino rock band composed of Ely Buendia on Frontman duties and guitars, Yan Yuzon on Lead guitar, Bogs Jugo on Drums and Dok Sergio on Bass.

Although the band itself is relatively new, all of its members have lots of experience in the Philippine music scene. Pupil is managed by Day Cabuhat (who also used to handle the Eraserheads) and Ely Buendia's wife, Diane Ventura, who was also manager for The Mongols.

Dok Sergio from the bands The Teeth and Daydream Cycle joined The Mongols' line-up during the fourth quarter of 2004, making it a five-man band. The Mongols' bassist Yan Yuzon moved to third guitar duties while Dok Sergio handled bass. The transitional five-man line-up was witnessed in The Mongols’ last single and music video entitled “Heroine”. In May 2005, guitarist, Jerome Velasco, a.k.a J. Astro, left to pursue a career in producing and recording studio engineering. The group's last gig under the name "The Mongols" was July 7, 2005.