AH why is he suddenly making that face ? Crazy cliffhanger, I'm scared too, Yeehyeon !

I think he can smell the pheromones? and is shocked? (⊙…⊙ )

But he could smell it before, right ? So why suddenly ? ╥﹏╥

It’s because he committed the mistake of knotting

My guess is that he's shocked at how good it was? Or that he even knotted

OH that's probably why ! He was so out of it when he knotted, but then came back to his senses and realized his mistake...

Yup he's most probably shocked !