The Core:

Personality: At the beginning, Jungwon's behavioral programming is simple: while (person's ability >= your ability), increase your ability until your ability > person's ability. Jungwon strives to be the best. According to her programming, her success depends upon how good she is, how many people support her, and how many people she can beat in a talent competition. She's also a little bit iffy on what to do with people who get in her way, and usually just brushes them off tersely. Jungwon is not patient in the slightest and has no qualms about forcing people out of practice rooms if she feels she needs to practice (which she doesn't, but let's pretend for argument's sake). For her, music is not a passion - it's a job, and she's determined to do that job right. She also tends to ignore individual humans, focusing on hard numbers and statistics like album sales. In other words, she's exceptionally boring at fansigns and only really appreciates topping charts and winning award shows.

After a while, she learns sympathy/empathy. She learns that others have feelings and she can't always demand her way with things, and becomes more patient. She's still not the nicest girl (or robot) around, but she's not kicking people out of rooms anymore. At fansigns, she starts paying attention to each individual fac and makes an effort to talk to them. She also learns passion, and realizes that she doesn't need to be the best. She learns that sometimes, friends can be useful and she shouldn't compete with them all the time - she still doesn't much like making friends, but she starts enjoying the company of the ones she has more. She's still pretty assertive, though, and starts trying to make the people she cares about better instead of just herself.

Edit: Even from the beginning, quite a few people tell her to cool it. She normally ignores it, but she catalogues each time and that accumulation helps to convince her that she could afford to be more laid back. There were two big events that really changed her view on things, though. First, she films a CF or something and works under a very strict PD. She deals with it at first, because she's grabbing that opportunity, but eventually she gets fed up and starts ignoring him. He starts yelling at her and tells her to pay attention, or else she's off, the ungrateful little brat. That sets her off, and she's dropped from that opportunity. When she complains to her members, they nod sympathetically but kind of laugh and tell her "he sounds like you". She denies it, but realizes after a while that his actions were somewhat similar to hers. The second was during a contest on a TV show between members (either singing or dancing). She was very cutthroat, because she saw it as a very good chance to prove herself, and did win. However, the loser was very gracious about their win, and a lot of netizens commented that the other girl should have won and Jungwon was kind of a . After the initial anger, Jungwon realized that she won the battle but didn't win the war. This also helped her with the acceptance of her position in the group.

Likes: Noise-canceling headphones; Hard rock/punk rock; mascara; ice hockey; being on stage; animal eye-masks; first-person shooter video games (develops over time)

Dislikes: Blues music; long wait times; being interrupted; mud; cats (unless they're declawed); being dismissed; people who don't use honorihics when they should; flowers; candy stores

Hobbies: Singing; dancing; audio mixing; reading books (especially mystery); origami

Habits: tilts her head when confused; folds origami if she's holding a piece of scrap paper; taps her feet when she's sitting down; blowdries her hair

Fears: At first, Jungwon was afraid of water because she always read that water + electronics = bad, and became paranoid of malfunctioning if she was submerged. She refused to swim or take a bath, and was wary of rain and showers. After some time passed, she got over that fear a little and gained a new fear of never being happy - always striving for something she can't ever have.
Trivia: 

She doesn't get out much, unless she has to

Thinks that romance is overrated and satisfaction at a job well done is so much better

Thinks learning languages that are not Korean or English is a waste of time (and Korean only because she lives in Korea)

Is a really good liar

If she doesn't want to talk to someone (which happens a lot), she'll just stare at them without saying anything.

Doesn't like to eat in general, because she thinks it'll dirty her insides. She's okay with drinking water, though.

Doesn't blush easily

Thinks crying is for wimps