Not That Cat, This Cat summary:

Nam Yooho loves cats so much that he enrolled in veterinary school. He is now in his third year, and has been having trouble lately. While taking care of Man-deuk, a stray cat, he meets a junior named Ryu Si-an, who appears in his dreams as a cat hybrid and dreams of having sex with him. After being struck by a kinky dream that violates his professional ethics, Yooho tries to avoid Si-an as much as possible...What the hell are you, and why do you show up as a cat in real life?!