[3][4] Early in his career, he featured on songs by both underground and mainstream hip hop artists including Dynamic Duo, Brown Eyes, and Epik High, being credited as either Kwon Ki-bum or Bumkey.

However, after undergoing vocal chord surgery to treat a chronic sore throat, he was left unable to speak.

[5] After signing with Brand New Music, Bumkey made his solo debut with the single "Bad Girl," in April 2013.

[6] Bumkey released his second single, "Attraction," in August with a music video starring Crayon Pop's Ellin.

[12] In October 2014, Bumkey was arrested and charged with selling and taking illegal substances, specifically ecstasy and Philopon, a type of methamphetamine.