U Hyeon has feelings for his homeroom teacher and intends to keep this hidden until graduation. However, when his best friend, Do Ha, finds out, U Hyeon fears Do Ha will judge him for liking men. Surprisingly, Do Ha responds with an unexpected proposal—to date each other until graduation—and so, U Hyeon, wanting to give up his feelings for the teacher, agrees to Do Ha's suggestion. (Source: Korean = bomtoon.com || Translation = NAY at MyDramaList) Edit Translation
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Where to Watch Heart Stain
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Cast & Credits
- Ha MinPark Do HaMain Role
- Kim Ji OYun U HyeonMain Role
- Kang Yeon JaeNam Jeong MinMain Role
- Kim Yi GeonKwon Jun SuSupport Role
- Shin Si YeLee So RiSupport Role
- Yoo Ho SuPark Tae MinSupport Role
Reviews

This review may contain spoilers
Could have been better but it lacks chemistry so badly...
I'm not the biggest fan of a love triangle but I'm even less a fan if the chemistry does not match the story.While we all know this is a low budget effort, they should have at least tried to have at least good chemistry to elevate the story. But they failed miserable.
It felt all detached and shallow and for me neither Doha nor Woohyun gave me the vibe that they long for each other. For me they felt steril and they could not convince me at all. I don't care about a high polished production but even in the worst thai productions at least the chemistry between the couples comes through even when everything else fails. First Woohyu loves his teacher and when he get rejected (of course), he seems to turn to Doha. But never ever I had the feeling this was the pivotal moment when his feeling changed. It just happens because the script said so. And of course they are together even when they are 8000km apart... yeah for sure.
In this series they fail with everything. While not cringe or stupid, it's just boring.and unbelievable. Cute/handsome actors can't make up for the story if there is no chemistry at all. I expected more from a South Korean series, but not every series can deliver. So this is the first big disappointment in 2025 and if you have skipped it, you don't miss a thing.
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This review may contain spoilers
Cute, as only teenage love stories can be...watch it for the feel good
A simple, and emotional teenage tale that I really enjoyed ....the boys are uber cute, and so is their story..:DBl-needle score: 8.5, Very high BL-ness
Woohyun has a crush on his homeroom teacher but knows that it can lead to nothing, and hence suppresses it, only confiding in his close friend Park Doha....following which Doha confesses that he likes Woohyun and proposes that they go out to see if that helps Woohyun get over his impossible crush. What follows is a simple and emotional teenagey tale of cute possessiveness, jealousy, heartaches and love....with a happy ending :D
The actors and the script makes it believable...but more importantly, it just makes you feel good...reminding of your first crush from school and the likes
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