Which girl is better?

Where did I discover such cute korean girls from you ask? I'm currently trudging through a epic 40 episode korean drama called Yuri Kudu or Glass Shoes and these two girls are the ones I would consider the most appealing. The girl in the first picture is Kim Jung Hwa (Supporting Actress) and the girl in the second picture is Kim Hyun Ju (Main Actress).

My brief synopsis of this drama up to this point- Two young sisters are separated at childhood after their father (who has brain cancer) gets killed by a truck. The older sister is adopted by her rich grandfather and the younger sister is hit by a truck and loses her memory. Fifteen years later, both sisters transform into exquisite women which mysteriously end up falling in love with the same guy and happens to work at the same company owned by the rich grandfather. All the while, they both have no idea that they are related but the storyline continuously intertwines their lives. Although I'm only halfway through the series, my predication of final outcome is that the sisters will be reunited BUT one will ultimately die of some grotesque disease.

Anyhow, I'm utterly torn between which girl I find to be more attractive... In my honest opinion, the supporting actress has much more distinct features that would make her much sexier. While on the other hand, the main actress is more innocent and natural looking, thereby creating a much cuter persona. Although hot girls are nice eye candy, more often then not they are not long term gf/marriage material. Consequently, I must opt for the main actress as the more desirable girl. What do you think?