Han Ji-eun
"Be a writer who touches people." This is what Ji-eun’s mother told her. And this is why Ji-eun strives to be a good writer. Young-jae calls Ji-eun a bird (i.e. bird brain) though. In high school, she is 48th in a class of 48. Nevertheless, with Min-heok guiding her, she is able to finish a story and a screenplay.
"Everything with her is ‘Aja! Aja! Fighting!" says Young-jae of Ji-eun. This reflects her can-do attitude towards everything. He also says that with her he is always happy and that she taught him what happiness is. Min-heok also says Ji-eun makes him happy.
Ji-eun is very naive, bubbly and fun. She shares jokes to lift Young-jae’s spirits and as conversation starters with Min-hyuk.
Lee Young-jae
Ji-eun always says how very childish Lee Young-jae is. For example, to trick Ji-eun into not going out with Min-heok, Young-jae makes up a story that his Grandmother is sick. In another time, to get Ji-eun to cook dinner, he pretends he has actually cut off his finger. When Ji-eun got a ChuChu Bar and he got an ice cream cone, he forced Ji-eun to exchange.
In the beginning, Young-jae shows a very arrogant nature towards Ji-eun and her friends. He calls them beggars on at least two occasions (two that I can remember, that is). When he got really pissed at Ji-eun for biting his finger, he throws her out of the house.
Young-jae is always making fun of Ji-eun. He calls her a rice bowl/rice cooker and a vacuum cleaner. His favorite nicknames for Ji-eun, though, is Bird and Chicken. When Ji-eun forbids Young-jae to call her by any of these names, he calls her Koko instead (i.e. sound of a chicken: koko).
Ji-eun in turn, calls Young-jae the King of Jerks. But Young-jae almost always makes up for it. For example, when threw her out of his car on the highway, he came back a few minutes later and waited till she got home safely. She always says he is a psycho and a weirdo.
Young-jae isn’t very articulate about his feelings. At one time, Hye-won took it upon herself to tell Ji-eun Young-jae is in love with her saying Young-jae cannot express this to her. Even though he teases Ji-eun "Honey, I love you", he doesn’t really seriously confess his love to her until the last minutes of the last episode!
Gang Hye-won
Gang Hye-won is Young-jae’s initial love interest. They have been friends since they were 9. She is a fashion designer and owns a clothes store. She is always dressing up Young-jae for interviews and events. She does actually wear some very fashionable pieces in the story and I personally find her very pretty.
In one episode, she asks Young-jae if she is more important and more special than Ji-eun. Young-jae admits to this and Hye-won tells him "No matter what I do, I’m more important to you than anyone. Forget that and you’re in trouble." This is the relationship between Hye-won and Young-jae throughout the story. Hye-won is always priority number one. He is by her side at her calling. On another episode, she makes Young-jae promise never to let her go until she allows it or sets him free.
Yu Min-heok
Yu Min-heok is the perfect bachelor. On one episode, he tells Ji-eun the girls say he is handsome and has some abilities, not to mention he is extremely rich. He is also a complete gentleman in stark contrast with the jerk Young-jae.
From the beginning of the story, he shows a friendly nature towards Ji-eun. Min-heok says Ji-eun makes him happy. For his birthday, he asks Ji-eun out as a treat for himself. He is always laughing at her jokes. He is Ji-eun’s mentor and helps her finish a story worthy of the movie screen. He is also Ji-eun’s confidante. She finds a shoulder to cry on Min-heok.
Throughout the story, Min-heok is very patient with his love towards Ji-eun. He is always willing to wait for Ji-eun to return his feelings.