Spoiler In Words: Lie To Me Ep. 1

I'm not sure I understand what's going on here. I mean, WHO in their right mind would call Yoon Eun Hye an ahjumma? There's gotta be some major transformation going on in the drama, 'cause from the posters she looks like one hot chick to me. 

Spoiler In Words

Good family background with no thoughts of marriage; used to live with the thinking that as long as one doesn't get married one will always be free. But unknowingly, somehow this became a burden: Often being laughed at and addressed as "ahjumma" by her friends because of her "advanced" age, she fears that there will be a day that she'll be worse-off than an "ahjumma". She perseveres and works hard like crazy in her studies and work without uttering a single complain, not receiving any social advantages.

Dreams of love, but always puts it off, saying: "Things like love..." but believes that there is that one true love out there. After a history of struggles, finally there appears to be an answer. But this is not the story of Kim Sam Soon the old maid, but mom's friend's daughter (a perfect faultless person), Gong Ah Jung's story. A woman who's fine even without romance, a woman who contrasts with love.