HAN HYO JOO!!!she got the best smile!hyo joo's smile is so natural & so genuine..
bo young, jung eunji and shin minah
Park Min Young
Gong Hyo Jin

Their smile literally changes their face.
shin min ah 
oh yeon seo
song ji hyo
Park Bo Young.
Gong Hyo Jin.
Moon chae won and shin min ah
Shin Min Ah, Park Bo Young (and a sweet voice) and Han Hyo Joo


Jung Eun Ji and Minah
Park Min Young and Yoon Eun Hye.
Park Bo Young
Park Shin Hye
Han Hyo Joo
Jung Ryeo Won
Han Ye Seul
Yoo In Na
Park Shin Hye
Moon Chae Won
Jung Ryeo Won
Shin Min Ah
Shin Min Ah and Moon Chae Won, of course. :)