Eun-hee (Ha-Neul Kim) is a returnee who is good at work but not good at interpersonal communication. After being abandoned by her fiance, she was transferred to edit a women's fashion magazine due to setbacks in her career. Hearing her colleagues' comments behind her back, Eun-hee was silently distressed and was so upset that she was ready to raise a pet dog. By chance, he met In-ho (Keun-Suk Jang), a considerate and lovely man. In-ho is a young and handsome classical ballet genius with perfect appearance. He was homeless and moved into Eun-hee's home because of his friend Eun-soo, and unexpectedly played the role of a pet lover. The two lived a romantic and happy life with their pets. Living together has caused subtle changes in their relationship until the senior Cha, whom Eun-hee had a crush on during college, appears and clearly expresses his love for Eun-hee. Who will be able to live in the home of Eun-hee's heart, the pet or the senior... The film is adapted from the popular manga "Pet Lover" by Japanese manga artist Yayoi Ogawa.