One Sunny Day

Eun Ha-Won is a college student. She is a bright girl who wants to be a veterinarian, but at home she is lonely. She is isolated from her family members. Eun Ha-Won lives with father, step-mother and step-sister after her mother died in a car accident. One day, she helps a mysterious old man. The old man suggests to her to live in a mansion and pursue her dream of becoming a veterinarian. Since than, she moves into the mansion and lives with three cousins Kang Ji-Woon, Kang Hyun-Min, Kang Seo-Woo and their bodyguard Lee Yoon-Sung.

The love story of Hyun Ki-joon and Gong Ah-jung. Scandals erupt as they announce that they lied about marrying because of pride.

A wealthy man and a poor stunt girl fall in love. But things get complicated when their souls become inexplicably swapped and dark secrets surface.