Brown Eyed Girls Gain Profile
- Stagename: Gain (가인)
- Surname: Son
- Firstname: Ga-in
- Nationality: Korean
- Birthdate: September 20, 1987
- Age: 31 (International), 32 (Korean)
- Western zodiac: ♍ Virgo
- Chinese zodiac: Rabbit
- Height: 163 cm (5 ft 4 in)
- Weight: 45 kg (99 lbs)
- Bloodtype: B
