Ga-In (가인), real name Son Ga-In (손가인), born on September 20, 1987, is a member of the South Korean girl group Brown Eyed Girls that debuted in 2006, the joint group 4Tomorrow, and the collaborative duo Ga In & Jo Kwon which features 2AM's Jo Kwon. She made her solo debut in October 2010 in which she took a different approach with her music and image than her fellow bandmate, Narsha: specifically, her music incorporated tango nuevo, Latin, and jazz elements. She released step 2/4 in October 2010, followed by a digital single Bad Temper in December 2010.

가인 on Last.fm.