This webtoon recently finished on Naver, so... spoilers below. In my opinion, we could tag...

This webtoon recently finished on Naver, so... spoilers below. In my opinion, we could tag this as both shoujo and shounen ai (but not yaoi).
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Boyfriend eventually decides that he wants to pursue a relationship even when his girlfriend is a guy, so they get back together. They have some lovey dovey moments, and all seems well... until their anniversary. While thinking back on their (original) times together, the boyfriend is again reminded of the differences between Jieun and Jihun, and he starts missing Jieun. He cries about it, and the girlfriend comforts him. Then she breaks up with him, because she doesn't want to cause her boyfriend any pain. For the time being, she decides to go back to her family. (Her siblings accepted her wholeheartedly.)

Girlfriend's friend lets the boyfriend know about this, and the boyfriend does some serious reflection. He realizes that he loves his girlfriend for who she is, regardless of gender, and chases after her. They make up, but she still has to go home for a bit because she's bought the train tickets, and her overprotective brothers will be super disappointed if she skips out.

It turns out that gender swapping is a family curse that happens to females when they find their true love. It's broken with the power of a true kiss (or when they fall out of love). So they kiss and the girlfriend returns to her original form. There's an epilogue of their photo album, and the album contains pictures from when she was both a girl and a guy.

It's not the most nuanced story in the world, but I wouldn't say that this webtoon is homophobic. It makes crude gay jokes, but it also features a character who falls in love with Jihun (aside from the boyfriend), and its ultimate message is that love transcends gender. Sure, she turns back, but the two of them have plenty of moments when they're both guys. Plus, even if their love sustains the trial, it'd still suck for Jieun to have to live in a body that's not consistent with her gender identity. There are slight hints here and there that beneath her smile, she's struggling as well.