Spoilers!
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Minho tries to fuck Yohan over with the help of Jun, but Jun betrays Minho for Yohan. Yohan makes Minho and another guy kiss and outs them as gays, which results in them being ostracized. Soon after graduation arrives, Jun kisses Yohan and then leaves for the US, cutting all contact with Yohan. Yohan is desperately searching for Jun the entire time. By the start of university, Jun returns to Korea with the expectation that he'll never see Yohan again, just for Yohan to turn up at university where he also got in. After some time of Jun dodging Yohan to the best of his abilities, Minho turns up with a plan to hurt Jun with acid. Yohan turns up at last second and protects Jun, getting hurt by the acid in Jun's place. This makes Jun feel very indebted to Yohan and takes care of him, secretly really enjoying being the caretaker for Yohan and loves the permanent damage Yohan suffers from. That's the main story, during the side stories we see them slowly getting together, mostly by Yohan pushing for it even if Jun also wants it. So happy ending over all.
SOMEONE SPOIL ME