Bluetory is the debut mini-album by South Korean pop-rock idol band CNBLUE. It was released on January 14, 2010, under FNC Music and distributed by Mnet Media. After being signed to the record label, the quartet was sent to Japan, where it independently released two mini-albums. While working with the band, frontman Jung Yong-hwa was cast in the television drama You're Beautiful (2009), where he first garnered recognition.

Following a series of video teasers for each member, Bluetory and its lead single "I'm a Loner" were concurrently released. CNBLUE was met with immediate commercial success; the mini-album topped the Gaon Music Chart for two consecutive weeks, and "I'm a Loner" peaked at number two on the Gaon Digital Chart. The latter earned the quartet two music show wins, the first being on Music Bank two weeks into its debut.

After being scouted by FNC Music's casting director, Jung Yong-hwa, Lee Jong-hyun, and Kang Min-hyuk met while auditioning for the agency. The three kept in contact before being accepted by the record company. FNC Music decided to send CNBLUE to Japan "where the idea of a band is more recognized"; the band saw it as an opportunity to "improve on our skills". The quartet initially debuted there under AI Entertainment in 2009, where it released its first two independent mini-albums Now or Never and Voice. The band would perform on the streets and in small venues throughout the country. Unable to speak Japanese, the members learned the language "in order to survive out there". In late September, bassist Kwon Kwang-jin left the band due to "personal reasons" and was replaced by Lee Jung-shin later that year.

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