100 Days My Prince - Season 1

Lee Yul begins a secret investigation after growing suspicious of his worsening health. Yun Hong Shim returns to Hanyang in search of her brother.

Yul uncovers the mastermind's identity and Kim So Hye's secret before coming under attack in the forest. Hong Shim is punished for refusing to wed.

Yul loses all memory, but gains a new identity as Na Won Deuk. Hong Shim begrudgingly chooses to become a wife to avoid life as a concubine.

Jung Je Yun searches for a link between the royal physician's murder and Yul's disappearance. Hong Shim puts Won Deuk to work to repay his debt.

News of the crown prince's passing is made public. Hong Shim is delighted to learn of Won Deuk's ability to read and write.

Hong Shim's reunion with her brother doesn't go as expected. Eunuch Yang notices something off about the crown prince's dead body.

Witnessing Won Deuk's martial arts skills, Hong Shim gets curious about his real identity. News of the queen's talisman sparks protest and debate.

Won Deuk celebrates an unforgettable birthday. Moo Yun completes his final task for Kim Cha Eon and prepares to leave with Hong Shim.

Je Yoon reunites with Hong Shim as the new county governor. To recover his memory, Won Deuk visits Hanyang and enters palace walls.

With Hong Shim and Won Deuk's help, Je Yoon concocts a plan to get in Park Sun Do's good graces. Rumors swirl about the crown prince being alive.

The king tries to regain control of his throne. Hong Shim and Won Deuk settle their affairs prior to leaving. Je Yoon sees Yul in Won Duk.

Cha Eon interrupts the coronation ceremony with a shocking announcement. Yul has trouble moving on from his memories with Hong Shim.

Hong Shim searches for Moo Yun in Hanyang with her father and Je Yoon in tow. Yul's competency is tested by a visiting envoy.

Won Deuk and Hong Shim reconnect as Yul and Yoon Yi Seo. Je Yoon assists Yul in his quest to find his diary — and answers.

Having regained his memory, Yul seeks revenge on a killer in his midst. Cha Eon plans bloodshed to achieve his goals.

Cha Eon leaves behind his final wish. Moved by the king's hopes and Je Yoon's plan, Yul makes good on his promise to Yi Seo.