Welcome Back is the debut studio album by South Korean male group iKon.

[2] On October 1, 2015, iKon released the first half of Welcome Back, along with two music videos for their promotional singles "Airplane" and "Rhythm Ta.

iKon's first studio full album was released on December 24, 2015, with the title tracks "What's Wrong?"

iKon's leader B.I was involved in the song composition for the majority of the tracks in the full album.

[12] On January 13, 2016, the Japanese version of the album was released and 53,207 copies were sold in the first day, topping the Oricon daily chart.