I is the first solo mini-album of South Korean singer Kim Jaejoong, a member of pop group JYJ.

An additional 20,000 copies manufactured to cope with the high demand were similarly sold out.

[3][4] A repackaged edition titled Y, which includes two new tracks and two instrumental tracks, was released on 26 February 2013 and experienced similar success, with all 50,000 initial pressings of the album selling out within 24 hours of sale.

[5] The mini-album debuted at the top of both the Hanteo and Gaon weekly charts in Korea and broke previous pre-order records in Japan.

[12] The album debuted at number two on the Billboard World Chart.