Yoon - the veterinarian working at the veterinary hospital - is paying close attention to Eun Woo. Yoon removed his mask to help him when he was sick and for the first time seeing Eunwoo's handsome face, Yoon was mesmerized. He said that there was nowhere to go, so Yoon dragged him to his home, and from there began to share the story of the two of them. The closer Yoon is with Eun Woo, the more curious he becomes …