Gain (가인) is a South Korean singer under APOP Entertainment. She is a member of the girl group Brown Eyed Girls. She made her solo debut on October 8, 2010 with the mini album Step 2/4.
- "Must Have Love" (with Kim Yong Jun of SG Wannabe) (2006)
- "I Happen to Love You" (with Jo Kwon) (2009)
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