Spoiler
Because he knotted which he has never done and which he was never supposed to do because when a golden alpha knots in a beta, the beta can either become severely paralyzed for life or even lose their life
Oh goddamn
Wtf!!! Will the mc get sick then orr??
No he won't. He will black out but be fine by morning. This also makes the ML question his existence because no beta should be able to walk away from a Golden alpha's knot like that without a trip to the hospital or even potential death. Even an omega would need a few days to recover from a Golden ghost alpha's knot. But yeehyeon was able to walk away the next morning with no injuries or side effects. Mr Liu became even more confused about what he is ╮(￣▽￣)╭
Why did th ml freak out???!