100 Days My Prince

100 Days My Prince is a 2018 South Korean television series starring Doh Kyung-soo and Nam Ji-hyun. The series aired on tvN from September 10 to October 30, 2018, every Monday and Tuesday at 21:30 (KST). It is one of the highest-rated Korean dramas in cable television history. Synopsis Lee Yul is the king's nephew who enjoys spending his days playing instead of studying. He enjoys playing with the peasant children alongside his best friend and guardian, Dong-joo. One day, as he is playing with the peasant children where they were playing as Villains, Yul uses his nobility status to punish the children by beating them up, oblivious that his actions were hurting them. The children could not object to this treatment due to Yul's status. A girl, Yoon Yi-seo intervenes and chides Yul for his cruel actions. Like Yul, Yi-seo is from a noble family, but is kind, smart and compassionate. Yul instantly develops a crush on Yi-seo and this causes him to change and become more studious in order to impress her. Yi-seo's father is a general and the right-hand man of the King. However, Yul's father is an ambitious man who is jealous of his brother, the King, and vies for the throne. Scheming with another ambitious man, Kim Cha-eon, they plot to overthrow the current King, with the promise that Cha-eon will be handsomely rewarded. One night, Kim Cha-eon begins the coup which sees the King and all his men and allies ruthlessly murdered, including Yi-seo's father. While fatally injured, Yi-seo's father instructs his elder son Seok-ha to take Yi-seo and run away, as Cha-eon is determined to wipe out the entire family. As Cha-eon is about to deal the killing blow, Yul, who has been witnessing the whole thing, comes out from his hiding place to stop Cha-eon, threatening that he will report this matter to his father. Cha-eon then carries Yul back to his father's mansion and it is then made known that he has been conspiring with Cha-eon for the whole thing all along, shocking Yul. Yul is removed from the scene and the coup is completed successfully. Due to this, Yul's father is crowned as the new King and Cha-eon becomes the Vice-Premier. Yul automatically assumes the title of Crown Prince, and is further shocked on the coronation day with the news of his mother's "accidental death". Despite the new King's surprise at the news, it becomes clear that the Vice-Premier will be the person who has the most power and control of the new reign.