From half-human, half-beast to a perfect human being

Min-gyu is half-human, half-beast, and his master, Eun-ha. However, Eun-ha lived with Min-gyu, unaware of his true nature. One day, she discovers... Please note that Min-gyu transforms from a half-human, half-beast to a human at age 25! (I made this up for the story; at age 25, he's no longer a half-human, but a normal human.) For serialization dates, please refer to Ttuaㅡㅅㅡ's notice board.