When a total eclipse of the sun takes place, Hae-Soo (IU) travels back in time to the Goryeo era. There, she falls in love with Wang So (Lee Joon-Gi) who makes other people tremble with fear. The plot: During a total eclipse of the sun, a 25-year-old 21st century woman, Go Ha-jin (Lee Ji Eun), is transported back in time to Goryeo Dynasty. She wakes up in the year 941, in the body of 16-year-old Hae Soo and there, she encounters the many royal princes of the ruling family. SBS aired a special episode, containing the historical introduction already presented in the August preview and a summary of the first seven episodes, was broadcast on September 14 for the Chuseok ... Modern-day girl IU suddenly drops into the Goryeo Dynasty in Moon Lovers: Scarlet Heart Ryeo – will her love for feared prince Lee Joon Gi change history?