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Series

100 Days My Prince

20181h 15m7.9 / 101 seasons

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.

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Season guide

Season 1

16 episodes available

Episode 1: Today Is Your Only Chance to Cry

1h 13m

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

Episode 2: Crown Prince in Great Agony

1h 8m

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.

Episode 3: Your Name Is Won Deuk

1h 9m

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.

On screen

Cast & Characters

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

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Episode 4: The Newlywed Couple in Debt

1h 13m

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.

Episode 5: Do You Not Consider Me Your Daughter Anymore?

1h 15m

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.

Episode 6: Do You Know How Much I Missed You?

1h 17m

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

Episode 7: Stay with Me

1h 16m

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.

Episode 8: You Are Not Won Deuk

1h 14m

Won-deuk celebrates an unforgettable birthday. Mu-yeon completes his final task for Kim Cha-eon and prepares to leave with Hong-sim.

Episode 9: Everything I Told about You Is Not True

1h 15m

Je-yun reunites with Hong-sim as the new county governor. To recover his memory, Won-deuk visits Hanyang and enters palace walls.

Episode 10: They Say His Highness Is Alive

1h 13m

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.

Episode 11: Vice-Premier Kim Is Missing

1h 19m

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.

Episode 12: The Return of the Crown Prince

1h 16m

Cha-eon interrupts the coronation ceremony with a shocking announcement. Yul has trouble moving on from his memories with Hong-sim.

Episode 13: Demand from Ming’s Envoy

1h 21m

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.

Episode 14: We Must Solve the Riddle

1h 21m

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.

Episode 15: Evidence of Vice-Premier’s Evil Deeds

1h 25m

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

Episode 16: The End of War between Crown Prince and Vice-Premier

1h 26m

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.

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