A man and a woman, deeply in love, long for each other as their fates get entwined in a war.

It’s the year 2050 and time travel exists thanks to Alice, the mechanism through which the intriguing practice is made possible. But a rumor based on a prophecy beings to spread about time travel coming to an end. When You Min Hyuk and Yoon Tae Yi are sent to the year 1992 to find out about the prophecy, Tae Yi realizes she’s pregnant and decides to stay in the past by herself. She changes her name to Park Sun Young and eventually gives birth to a beautiful son named Park Jin Gyeom, whose mental health suffers due to radiation exposure. Fast forward to the year 2010, and Sun Young is murdered by someone. 10 years after her death, her son Jin Gyeom is on a mission to find who is responsible for his mother’s death. But while searching, he runs into Yoon Tae Yi, a physics professor who looks exactly like this mother. What will become of these individuals caught tragically between time and space?

Seo Ji Ahn, a former rich girl, was forced to be her family's breadwinner after her father's bankruptcy. She is now a contractual employee and living her life with restrained emotion. The drama chronicles her struggles to find new meaning and happiness in life.

Set during the Silla dynasty, Sam Maekjong is the son of the fallen king and present queen regent, Jiso, but he has been kept in hiding for protection ever since he was a young boy, when his father was murdered. Over the years the powerful nobles have tried and failed to usurp power from Jiso, causing her to grow wary and later even reluctant to hand the throne over. As her son comes of age, she creates the Hwarang, an elite group of male youth who train in fighting and education. Their existence cuts across the existing power factions and Sam Maekjong is amidst their ranks under the false name Kim Ji-Dwi, unbeknownst to other Hwarang members.