100 Days my Prince

Full Spoilers! After Crown Prince Lee Yul falls off a cliff and nearly dies in an attempted assassination, he loses his memory and lives under a new name for 100 days. During this time, he is forced to marry Hong Shim, who he clashes with at first, but soon comes to love. 

100 Days My Prince (2018) stars Do Kyung Soo (D.O. of EXO), Nam Ji Hyun, and Kim Seon Ho.