As teens, Yoon Soo Wan (Ku Hye Sun) and Park Dong Joo (Lee Sang Yun) fell in love, but they were separated after a tragic accident that left Soo Wan blind and forced Dong Joo to leave the country. Twelve years later, Soo Wan has regained her sight after a surgery and now works as a paramedic, while Dong Joo has become a surgeon. They reunite working in the same hospital, but Soo Wan is engaged to another man and doesn’t recognize Dong Joo, who opts not to tell Soo Wan who he truly is. Is there any second chance at love in their future, or will it all stay firmly in the past?

During the Joseon Dynasty, Kim Yoon Hee (Park Min Young) disguises herself as a boy to support her struggling family by taking entrance exams for other students at Sungkyunkwan University. When the principled Lee Sun Joon (Park Yoo Chun) discovers her scheme, he unexpectedly helps her take the exam under her brother's identity and enter the university herself. They become roommates and classmates, with Yoon Hee befriending the playboy Goo Yong Ha (Song Joong Ki) and rebellious Moon Jae Shin (Yoo Ah In), while simultaneously developing feelings for Sun Joon. As she struggles to maintain her secret identity, Yoon Hee must navigate the challenges of university life and her growing emotions. This is a 2010 South Korean historical drama series based on a bestselling novel and directed by Kim Won Suk and Hwang In Hyuk.