Chiyoung actually knows that the puppy is heesong from the start. Okay so heesong planned to escape and went back to his brother to the gambling den
He transforms back into his human form, escaped yoon chiyoung and went back to the gambling den*
And then after he went back there heesong and his bro had a little talk and his brother gives him a liquor that has a drug on it and goes unconscious.(He got sold off by his brother by that horse beast bastard)
Okay yeah so chiyoung saves him and bought him back at chiyoung place. And uhh
Umm i kinda forgot some parts but after heesong woke up he got nervous thinking about how chiyoung probably knows that the puppy he took care was actually a beastman so yeah he hid in the closet when he heard footsteps of chiyoung coming and after that they had a talk then chiyoung told him that he actually knows the puppy was a heesong from the start(they started making out after that lol)
fuck all the other weird spoilers someone lmk when he finds out his identity