A young woman from the 21st century (IU) time travels to the Goryeo era. She gets close to the princes, especially the future king, Wang So (Lee Jun-Ki).
Private eye Yoon San (Lee Joon) uses his vampire powers to solve cases and help people. He realizes that his past might have something to do with a case.
Special Forces captain Yoo Si-Jin (Song Joong-Ki) meets Kang Mo-Yeon (Song Hye-Kyo), a surgeon from Doctors Without Borders.
A former secret agent (Park Shi-Hoo) uses his martial arts skills to protect his neighborhood and investigate the mission that ended his career.
A vampire surgeon (Ahn Jae-Hyeon) on the hunt for his parents’ murderers struggles with his thirst for blood, and falls in love with a beautiful doctor.