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During a total solar eclipse, Go Ha Jin is suddenly transported back in time to the early days of the Goryeo Dynasty during the reign of King Taejo. She awakens in the body of a 16-year-old girl named Hae Soo and begins living in the household of the 8th Prince, Wang Wook, who is married to Hae Soo’s cousin.

As she adjusts to life in the palace, Hae Soo befriends several of the princes and crosses paths with the isolated and feared 4th Prince, Wang So. Despite knowing she should avoid the dangerous politics surrounding the succession to the throne, she becomes unintentionally entangled in the power struggles of the royal family. As rivalries intensify and multiple princes develop feelings for her, Hae Soo finds herself caught in a web of love, loyalty, and political intrigue.