It is a series of two Japanese compilation albums released by the Avex sub-label Rhythm Zone on June 30, 2010,[1] two months after former Tohoshinki members Jejung, Yuchun, and Junsu left the band to form JYJ.

[2] The first compilation album in the series, Complete: Single A-Side Collection, includes all A-side singles released by Tohoshinki since their Japanese debut in April 2005.

The two albums were compiled together in the exclusive Complete Set Limited Box, which was also released on June 30, 2010.

The Complete album series marked the closing releases under their contract with Rhythm Zone.

[4] The Single B-Side Collection debuted at number four on the same chart, selling 100,729 in thirteen weeks.