Sandara or Dara is nearing her 30th year. She's the stereotypical never been kissed, no boyfriend since birth, himono-onna. She's brilliant at work. Her boss loves her and her workmates adore her. 

She's socially inept, preferring quiet café moments with close friends over parties. She has a beautiful face which she hides beneath a pair of unfashionable, prescription glasses. When she's not working, she wears either ratty sweats or faded scrubs everywhere. 

She gives inappropriately sarcastic but on point running commentaries on tear jerker romantic scenes on tv and in the movies. Just when you're about to spazz out, she'll make sarcastic comments about the plot or the characters. She's very vocal about her opinions on "real-life" romantic relationships and has sworn off romance altogether

Although ironically she has one weakness. She lives and breathes for kdramas. She'doesn't believe in real world romance because koreanovelas ruined it for her. She would rather watch kdramas than deal with stupid men whose maturity stopped growing after high school. Kdramas trump reality everytime.

Kwon Jiyong or GD is her best friend and flatmate for more than a decade. He's your stereotypical ladies man. He's not too tall but his lean, athletic body makes him seem taller than he is. He's smart, dresses fashionably and oozes charisma. It also didn't hurt that he's rich and holds a high powered job that he's remarkably good at.

He has perfected the art of seduction but superlatively at relationships. His first girlfriend was his only long term relationship. They only lasted that long because they were the campus "it" couple and had reputations to uphold. After that relationship, girls went in and out of his life in rapid succession. He still says he believes in love. He swears that once he finds love he won't waste any time and will marry the woman if she'll have him.

There was a time when Dara fancied herself in love with GD but seeing his track record she'd rather keep her heart safe. So she made a promise to herself she won't ever fall in love with GD again. 

There was a time when GD fancied himself in love with Dara but seeing her scoff at real life romance all the time he'd rather keep the friendship than gamble with love. So he made a promise to himself he won't ever fall in love with Dara again.