"Scarlet Heart" is a popular South Korean television series that aired in 2016. The story follows Go Ha-jin, a modern woman who time-travels to the Goryeo Dynasty after falling into a lake during a solar eclipse. There, she inhabits the body of Hae Soo, a noblewoman, and becomes entangled in the lives of the royal family, particularly with the Wang princes. The series explores themes of love, loyalty, and political intrigue as Hae Soo navigates her new life in the past. It features a strong ensemble cast, including Lee Joon-gi as Wang So, and has gained a significant fanbase both domestically and internationally.