Go Sung Yeon 15 years old birthday: April 08

Go SungYeon personality is that She may seem unapproachable but she's really very friendly. She is kind. A bit sarcastic and quite moody at times but she has a really big heart. She is tough, especially when other people hurt the people she loves. She is quick-tempered, especially when she's tired. She is discreet, though, and always thinks about what other people might feel about her words and actions. She really cares about the people she loves and can be pretty protective of them. She is quite childlike, but in a good way. She can speak English, Korean, Filipino and French.

her height is 157 cm, and weighs 43 kgs.

she doesn't mean to but, she tends to Sleeps late, snaps her fingers when she is at a loss for words, tilts her head to the side when she is thinking

she likes reading, singing, playing computer games

she's a blood type O

and her 'catch phrase' is "OMO!!!"

her mom is a businesswoman and her dad is a music teacher

Her family is like the perfect family she had ever dreamed of. However, her parents were keeping a secret from her, which she only learned recently (when she turned 15). Both of her parents are married to other people. Her parents' marriage is not legal since they were not divorced with their spouses yet. Both of them don't have other children with their former spouses. They kept it as a secret from her for a long time because they were afraid she might not handle it well because of her childlike attitude. However, she is more mature than what they thought, and they continued living as if nothing happened.

she has two bestfriends Sunny of SNSD and Dongwon of BEAST she met them in high school

her stage name is also SungYeon, She is the leader and the Lead vocals of the group and if you like SungYeon

YOU'RE OFFICIALY A YEPPEO!!!!

that's right her individual fan-club is called the 'yeppeos' and their fan-club color is LAVANDER