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 kisskh) 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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Cute but uninspiring and forgettable! Same old, same old!
This is cute and everything, but it’s pretty much the same stuff I have seen before. It follows all the typical tropes, so while it's fun to watch, there is nothing to run home about.Park DoHa and Woohyun had chemistry but it felt very fragmented and lacking in depth.
While they did tried to capture the essence of first-love jitters and the youthful charm that often accompanies the first teenage crushes, it didn’t feel convincing or genuine enough. There wasn't just enough chemistry on the table for me to ignore the plot holes.
As for Woohyun’s crush on his homeroom teacher, it came across more as a plot device than a meaningful subplot. There was little to no emotional depth in that storyline, making it hard for me to care about.
Also, I'm still not sure how or when Woohyun fell for DoHa. The pacing felt off and it seemed like they needed to be together just because there were only two episodes left. The pacing felt all over the place especially in the last 2 episodes.
Honestly all the connections felt very surface-level and superficial.
That said, I did enjoy the friendship between Woohyun and Sori even though their friendship wasn't explored much. The banters were cute.
This is my first time seeing the actors and with what is given, I think they did a decent job. The problem for me was more on how the characters were written than acting here.
Overall, this was enjoyable for a one time watch, but it doesn’t really bring anything fresh or stand out in any way. It's cute but ultimately forgettable in the end.
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