Jiho's actions being affected by her past is def true (and not wanting to risk the friendship for sth she fears will be just a "momentary phase" for Woohui) but to somehow lump your biphobic and borderline sexist bullshit into this is wild.
What Ji-ho fears is the typical "straight girl trap". This has nothing to do with bisexual people. An average bi woman will treat a woman like an average lesbian would. Saying that bi women don't see other women as an actual dating option and only opt for women bc of sex is just so fcking nasty and untrue.
You're biphobic, sexist and bigoted. Imagine being a part of a group that's discriminated against bc of their sexuality just to turn around and do the same to other people of different sexuality. You're literally no better than those straight man who claim that "a woman would never be able to have a serious long-term relationship with another woman bc they need a dick". Bigoted, sexist, homophobic.
I'm a lesbian. My partner is bi. We love each other.
It sounds like you've had a bad experience with someone, but it's not fair or healthy to stereotype a whole group of people because of that. Whatever happened, I hope things are better for you in the future and that you can move on from these feelings you've got against bi folks.
If you like vaginas that are dick flavoured then have at it as for me I'm not and will never be interested in a bisexual woman and it's not that I dislike them cause I don't mind being just friends ONLY but I can say that they are free to sleep with men cause it's what they like but I'll only date another lesbian because we would be a better fit for eachother and I'd rather fall for a lesbian.

Jiho's POV might be this....her friend back in high school said she shouldn't stay being lesbian and Jiho when she started college made up her mind to live freely and sleep with whoever she wants to and now Brown is saying date me but a lesbian would think yeah you want us to date right now bit after college you can go back to being straight and leave me so while I date you in college it would be me wasting my time while I could be having sex with any woman I want to inclusive of Pink who actually is a lesbian.
Bisexual women don't get why most lesbians won't date them and this is what's happening with Jiho,when Bisexual women date lesbians they are more about the sex than actually loving the lesbina they are dating while on the other hand they love the men they date but the sex with men don't satisfy them and it's why they still try to sleep with other women secretly especially they go after lesbian women over Bisexual women.
Jiho is ok hiding her feelings and lieing to Brown because she's afraid to take it all as a long term relationship which is what she really wants but with a woman who'll stay for good and not sexually confused....BUT.....I think that Brown also needs to take some time to figure out if she's bi or actually a lesbian and I think maybe Pink can help her figure it out and i think Pink should try to sleep with Jiho again and only then Jiho would realise that she can't do it cause she might feel guilt and that's a way to move forward toward Brown seriously.