"Moon Lovers: Scarlet Heart Ryeo" is a South Korean television series that aired in 2016. It is a historical romance drama based on the Chinese novel "Bu Bu Jing Xin." The story follows Go Ha-jin, a modern woman who time-travels to the Goryeo Dynasty and finds herself in the body of Hae Soo, a noblewoman. She becomes entangled in the lives of the Wang princes, navigating love and political intrigue. The series features a star-studded cast, including Lee Joon-gi as Wang So, the fourth prince, and IU as Hae Soo. The drama explores themes of love, loyalty, and the struggles for power among the royal family. Its captivating storyline and beautiful cinematography garnered a dedicated fanbase both in South Korea and internationally.