Hong Jo is a cat who has mastered the art of transformation into human form. He wants to become human for his owner, and in order to stay by her side, he starts living a double life. Kim Sol Ah is a woman in her 20s. She loves people and tries to protect the ones she loves. Hence, she attracts many cat-like people. Her father is like a Persian cat, her crush is like a Siamese cat, and others only make her worry and fuss. In the end, she brings Hong Jo home thinking he's a cat but ends up in a completely different situation.