Why is Han Seungyeon always smiling?

KARA's Han Seungyeon is known to her fans for having an eye smile, a smile that creates moon eyes when you smile. She is also known for smiling excessively and she explained why on the March 27th episode of Star Golden Bell, "If I don't smile, it feels like I'm staring someone down." She named this as her complex and explained why it is so. She continued, "When I'm not smiling, it's very different from when I am. People said it feels like I'm glaring at them when I'm not smiling so I tend to smile all the time." Park Gyuri also picked Seungyeon as a member who doesn't go well with a sexy charisma concept so I guess Seungyeon belongs to the cute kind. Check out the vast difference between her non-smiling and smiling face.