Moon Lovers: Scarlet Heart Ryeo (2016)

When a total eclipse of the sun takes place, Go Ha Jin is transported back in time to the start of the Goryeo Dynasty of Korea during King Taejo's rule. She wakes up in the body of 16-year-old Hae Soo and finds herself in the house of 8th Prince Wang Wook, who is married to her cousin. She soon befriends several of the princes and meets the ostracized 4th Prince, Wang So. Although she knows she should not get involved in palace intrigues over the succession to the throne, she inadvertently becomes a pawn in the struggle, as several of the Princes fall in love with her.