Responses

Spoiler
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Yes, Dohoon explains to Hakyum in chapter 27 that he missed his test day, so he assumed he was a beta this whole time because he never experienced any symptoms of being an alpha. Also, because almost everyone in the town are betas.This is happening during his first rut, so obviously he doesn't realized until Hakyum explains it to him.
I insta thought "is he in his rut?" and "what if he will manifest as alpha now"