BTS' first members were recruited through Big Hit's "Hit it" auditions in 2010 and 2011. The original lineup went through several changes before the final group of members was established in 2012. Half a year prior to debut, the members began building their name and creating a relationship with fans through Twitter, video blogs, fancafe posts, and by releasing various song covers via KZread and SoundCloud.Before debuting in 2013, RM was already performing as an underground rapper and had released several tracks informally, including a collaboration with Zico. Jin had been a student at Konkuk University, majoring in acting, before being streetcast for auditions, while Suga was an underground rapper in Daegu. J-Hope, who was part of a street dance team named Neuron, was active in the underground dancing scene, participating in various battles and competitions.
Before joining Big Hit, Jimin entered Busan High School of Arts as the top student in modern dance, but later transferred to Korea Arts High School with V, who auditioned in Daegu. Jungkook was cast by multiple agencies after leaving auditions for Superstar K, but eventually chose Big Hit after seeing Rap Monster's rap.The group's debut single album 2 Cool 4 Skool, the first installment in their "school trilogy" series, was released simultaneously with its lead single "No More Dream" on June 12, 2013.
While the album peaked at number five on the Gaon Album Chart and sold over 105,000 copies, "No More Dream" and the subsequent single "We Are Bulletproof Pt.2" were not major hits. Expanding their endeavors into Japan, "No More Dream" was later re-recorded in Japanese and released on June 4, 2014.The second part to the "school trilogy" was the extended play O!RUL8,2?, released on September 11, 2013, which sold over 120,000 copies to date and peaked at number four. Its supporting singles "N.O" and "Attack on Bangtan" failed to chart high. That same month, BTS starred in their own variety show, SBS-MTV's Rookie King Channel Bangtan.