S01E01 Today Is Your Only Chance to Cry
Lee Yul begins a secret investigation after growing suspicious of his worsening health. Yeon Hong-sim returns to Hanyang in search of her brother.
100 Days My Prince
I will marry you someday.
Overview
Lee Yool falls off a cliff and nearly dies in an attempted assassination. He loses his memory, and wanders for 100 days under a new name and personality. During this period, he meets Hong Sim, head of the first detective agency in Joseon.
Episodes
S01E02 Crown Prince in Great Agony
Yul uncovers the mastermind's identity and Kim So-hye's secret before coming under attack in the forest. Hong-sim is punished for refusing to wed.
S01E03 Your Name Is Won Deuk
Yul loses all memory, but gains a new identity as Na Won-deuk. Hong-sim begrudgingly chooses to become a wife to avoid life as a concubine.
S01E04 The Newlywed Couple in Debt
Jung Je-yun searches for a link between the royal physician's murder and Yul's disappearance. Hong-sim puts Won-deuk to work to repay his debt.
S01E05 Do You Not Consider Me Your Daughter Anymore?
News of the crown prince's passing is made public. Hong-sim is delighted to learn of Won-deuk's ability to read and write.
S01E06 Do You Know How Much I Missed You?
Hong-sim's reunion with her brother doesn't go as expected. Eunuch Yang notices something off about the crown prince's dead body.
S01E07 Stay with Me
Witnessing Won-deuk's martial arts skills, Hong-sim gets curious about his real identity. News of the queen's talisman sparks protest and debate.
S01E08 You Are Not Won Deuk
Won-deuk celebrates an unforgettable birthday. Mu-yeon completes his final task for Kim Cha-eon and prepares to leave with Hong-sim.
S01E09 Everything I Told about You Is Not True
Je-yun reunites with Hong-sim as the new county governor. To recover his memory, Won-deuk visits Hanyang and enters palace walls.
S01E10 They Say His Highness Is Alive
With Hong-sim and Won-deuk's help, Je-yun concocts a plan to get in Park Seon-do's good graces. Rumors swirl about the crown prince being alive.
S01E11 Vice-Premier Kim Is Missing
The king tries to regain control of his throne. Hong-sim and Won-deuk settle their affairs prior to leaving. Je-yun sees Yul in Won-deok.
S01E12 The Return of the Crown Prince
Cha-eon interrupts the coronation ceremony with a shocking announcement. Yul has trouble moving on from his memories with Hong-sim.
S01E13 Demand from Ming’s Envoy
Hong-sim searches for Mu-yeon in Hanyang with her father and Je-yun in tow. Yul's competency is tested by a visiting envoy.
S01E14 We Must Solve the Riddle
Won-deuk and Hong-sim reconnect as Yul and Yoon I-seo. Je-yun assists Yul in his quest to find his diary — and answers.
S01E15 Evidence of Vice-Premier’s Evil Deeds
Having regained his memory, Yul seeks revenge on a killer in his midst. Cha-eon plans bloodshed to achieve his goals.
S01E16 The End of War between Crown Prince and Vice-Premier
Cha-eon leaves behind his final wish. Moved by the king's hopes and Je-yun's plan, Yul makes good on his promise to I-seo.
Cast
Doh Kyung-soo
Crown Prince Lee Yool / Won-deuk
Nam Ji-hyun
Hong-sim / Yoon Yi-seo
Cho Seong-ha
Kim Cha-eon
Cho Han-cheul
King
Oh Yeon-ah
Queen Park
Ji Min-hyuk
Prince Seo-won
Kim Seon-ho
Jung Je-yoon
Jung Hae-kyun
Hong-sim's Stepfather
Han So-hee
Kim So-hye
Heo Jung-min
Kim Soo-Ji
Kim Jae-young
Moo-yeon
Jo Hyun-sik
Eunuch Yang
