WAITTTT, you are onto something. I think I vaguely remember a chapter where Junhyeok's mom called Suah or Suah got a call from her. And she is a pharmaceutical CEO. Come on, wouldn't be far fetched that she got a willing test subject to pacify her son's omega self issues and at least live/appear like a normal beta, at least to trample any heat issues. Just ditched the idea of an alpha son altogether as she does not want Junhyeok to suffer anymore due to his secondary gender.

I fear su ah may still be a demon if those marks are from him secretly getting his blood drawn by juhyeok’s mom for her to make him special suppressants bc of how su ah permanently changed juhyeok’s pheromones