A story of a 25-year-old Go Hajin who is transported back in time to the Goryeo Dynasty. She then wakes up in the body of Lady Hae Soo and finds herself amongst the ruling princes of the Wang Family.
Starring IU, Lee Joon-gi, Kang Ha-neul, Hong Jong-hyun, Baekhyun, Nam Joo-hyuk, Kim Ji-soo, Yoon Sun-woo, Kim San-ho, Seohyun