Cinderella and the Four Knights(2016)

Eun Hae Won is a university student who is a pure girl who wants to become a veterinarian but is alone at home. separated from his family members. Eun Hae Won lives with her father, stepmother, and stepsister after her mother died in a car accident. One day he helped a mysterious old man. The old man guessed that he lives in a mansion and follows his dream of becoming a veterinarian! Since then, he moved to a mansion and lived with his three cousins ​​(Kang Ji Won - Kang Hyun Min - Kang So Won) and their bodyguard Lee Boon Sung...