Oh Yeon Seo was a strong lead in "Come Back Mister". She will do it again this time because the character is right for her. I don't get tired of viewing her onscreen because she is so lovely, tall, and lovable.
Lead actors have more speaking roles and camera focus more at him/her. For me, I like to look at pretty female lead actress on screen, acts on cue and is never conscious of how she looks and will always be pretty whatever the portrayed emotion is. That is Oh Yeon Seo, always beautiful and superbly good at acting. The reason why she is the lead actress.
The very thing i hate most is when the soon to be ex-wife implicated Oh Yeon Seo in her bid to stop her husband from divorcing her. What a stupid move.