100 Days of Deception

tvN is gearing up for a fresh blend of history and espionage with 100 Days of Deception, a sageuk spy thriller that also packs a romantic punch. Written by Ryu Bo-ri and directed by Yoo In-shik, the series brings together a stellar cast led by Kim You-jung, Park Jin-young, Kim Hyun-joo, Lee Moo-saeng, and Jin Seon-kyu. Set to premiere on October 10, 2026, the show will run for 16 episodes, with Netflix handling international streaming. The tone balances high-stakes political intrigue with the emotional pull of a love story caught in the crossfire. Early buzz points to strong audience anticipation, thanks to the cast's proven track records and the fresh genre fusion.

Studio Dragon, the powerhouse behind hits like Crash Landing on You and Goblin, is co-producing with Nangmancrew, signaling a significant investment in production values. The series promises to deliver not just sword fights and secret plots but also the quiet moments that define its characters. Ryu Bo-ri, known for her sharp dialogue and intricate plotting, weaves a narrative where every whisper could be a lie and every glance a clue. With principal photography underway, the team is building a visually rich Joseon-era world, from opulent royal courts to shadowy back alleys.[edit]

Joseon, 18th century. A kingdom built on Confucian order is quietly rotting from within. Behind the gilded halls of the royal palace, a shadow war rages among noble families, each hungry for power. Into this volatile landscape steps a brilliant strategist, a low-ranking official whose mind for patterns and people makes him invaluable to the crown. He is tasked with rooting out a spy network that has been feeding information to a neighboring kingdom for years. But the deeper he digs, the more he realizes that the rot reaches the highest echelons of power.

Across town, a woman moves through the city's underbelly with practiced ease. A skilled operative trained in combat and deception, she works for a clandestine group that answers to no one. Her latest mission: infiltrate the very spy ring the strategist is hunting. When their paths collide, neither knows the other's true allegiance. Their partnership is born from necessity, each using the other as a tool. But as the layers of the conspiracy peel back, they discover that the mastermind behind it all has been playing a much longer game, one that involves a lost royal heir and a plot to overthrow the monarchy itself.

The 100 days of the title refer to a ticking clock. A critical document, hidden somewhere in the capital, contains the names of everyone involved in the conspiracy. If it falls into the wrong hands, it could trigger a civil war. The strategist and the operative must find it before the 100 days are up, all while dodging assassins, double-crossing allies, and wrestling with their growing feelings for each other. The series builds its suspense through tight deadlines, narrow escapes, and puzzles that require both brains and brawn to solve. Each episode peels back another layer, revealing that trust is a luxury no one can afford.[edit]