I get what you're saying but the drama is FANTASY so everything isn't going to be logical
They brought him back to the hospital the same day. I'm not trying to be rude are anything but if you don't understand what happened in the episode just rewatch it.
I bench watch the drama and I cried so much my eyes are swollen. The way choi Kang chi was treated both before and after they found out he was half human was so unfair. Tbh the only one I saw that show him love and treat him equally was his adopted father's and Suzy. And I don't see why everyone got scared of him in his gumiho form he was so attractive. I'm still in tears. *My English isn't the best so sorry for any mistake*