- Birthname : Kim Hyo Yeon
- Name Meaning : Evergrowing
Instubbornness
- Nickname in SNSD : Bright Snowwhite
- Other Nicknames : Dancing Queen, Princess Fiona, Hyo fit and firm, Apple Princess, Hyon
- Birthday : September 22, 1989
- Blood Type : AB
- Height : 160 cm
- Weight : 48 kg
- Position : 1st Lead Dancer, Supporting Vocalist
- Favourite Numbers : 85
- Hobbies : Dancing
- Speciality : Chinese, Dance
- Years of Training : 6 years and 1 month
- Discovery: 2000 SM Casting System
- School(s): Studied in Beijing, China for Mandarin Chinese
