Han Seung Yeon
- Stage Name: Seung Yeon (승연), Han Seung Yeon (ハン・スンヨン)
- Real Name: Han Seung Yeon (한승연)
- Nickname: Ham, Choding, Big-smile-no-eyes
- Birthdate: July 24, 1988
- Birthplace: Seoul, South Korea
- Blood type: A
- Height: 160cm
- Weight: 43kg
- Religion: Christian
- Tenafly High School (New Jersey)
- Kyung Hee University
- Languages: English (fluent), Japanese (basic)
- Favorite Artists: G.O.D., Beyoncé
- Skills / Talent: Singing, dancing, impersonating Gollum (Lord of the Rings)
- Hobbies / Interest: Reading, listening to music, watching anime, making random cute sounds
Seung Yeon debuted as a child actress in a cameo role on the drama Star In My Heart in 1997. After her debut with KARA, she appeared in SS501's Japanese MV "LUCKY DAYS" and become the host of the TV-Show Han Seung Yeon MSL Break from 2007 to 2008. She also replaced Tiffany of SNSD as co-host of Boys and Girls Music Guide with Kim Hye Sung, later with actor Kim Soo Hyeon, and became part of MBC's entertainment news show Section TV as a "pop columnist", debuting on November 21, 2008.
Han Seung Yeon almost got into medical school but gave it up because she wanted to be a singer instead. Her parents were initially resistant to the change but eventually gave their consent.
- [2015.04.02] Geuttaen Alji Mothaetnabwa (그땐 알지 못했나봐; I don't think I knew that back then) (with Lee Sang Gon of NOEL)
- [2016.07.25] Geuaen Na (그앤 나; I Am Her)
- [2016.12.19] Jal Itni (잘있니; Good)
- [2019.01.25] I Love Me
- [2009.04.01] Why Did You Come to My House OST (#2 Gijeok)
- [2011.08.29] Warrior Baek Dong Soo OST Part.8 (무사 백동수)
- [2010.11.08] Mary Stayed Out All Night OST Part.2 (#2 Super Star)
- [2014.03.17] Her Lovely Heels OST Part.2 (#1 Should I Love Alone)
- [2014.06.13] Secret Love OST (시크릿 러브) - (#1 First Love) (with Gyuri)
- [2014.09.24] Blade Man OST Part.1 (아이언맨) - (#1 Hello) (with Gyuri)
- [2014.10.29] Fool Victor OST (#1 Two People) (with Kim Soo Hyung)
- [2014.11.24] Guitars and Hot Pants OST (#1 Can Be Heard From The Stars) (with Kim Da Hyun)
- [2009.02.26] Nassun - Nassun Happyface (#2 Nolleowa (feat. Seung Yeon of KARA))
- [2010.01.10] MBC Music Travel LaLaLa Live Vol. 7 - (#2 "Gil" ("Road") ) (SeungYeon & KARA)
- [2010.01.24] MBC Music Travel LaLaLa Live Vol. 11 - (#1 Bingeul Bingeul) (SeungYeon, Gyuri, Nicole (KARA) & No Brain)
- [2011.12.24] Immortal Song 2: Christmas Special (#1 White Winter) (SeungYeon, Ji Young & Nicole)
-  Star in My Heart
-  More Charming by the Day
-  URAKARA
-  Salamander Guru and The Shadows
-  A Bit Of Love
-  Jang Ok Jung
-  Her Lovely Heels
-  Come! Jang Bo Ri
-  Han Seung Yeon MSL Break
-  Boys and Girls Music Guide
-  I Need A Family Season 2
-  Section TV
-  Quiz Sixth Sense
-  Every1 My Pet
-  Animal Farm - present
-  We Got Married - Pit a Pat Shake
-  Running Man
-  ''THE SHOW'' All About K-Pop
-  KARA The Animation
-  EPIC - Mary Katherine (Korean Dub)
-  Victor the Fool by Joachim de Posada - (Laura's voice)
- She is a great friend of Girls' Generation's Taeyeon.
- She has two hedgehogs (Wonie and Sungie) and two puppies (Puri and Nubi).
- Her motto is "Go with what you believe in".
- Her favorite food is BuDae Soup/Steam pot.
- Her favorite color is pink.
- During her KARA days, some of her hobbies was hugging Nicole and teaching her wrong Korean words just for fun.