Tonight is Kim Hyun-joong's third Japanese single.

[1] There are five available versions of this single which has five completely different image concepts for each of the single covers.

Each version includes different limited editions that may include a DVD with the music video to the three new songs.

[2][3][4][5][6] On the first day of its release, Tonight single came up to second place right away with 101,818 copies sold,[7] and taking the number two spot by the end of the week.

[8] The album received Gold certificate for selling more than 100,000 copies and has recently been certified platinum with 250,000 copies sold worldwide.