Everything You Need to Know Before 'The Haunted Palace' Premieres on April 18

"The Haunted Palace" premieres on SBS in one week, on April 18, and the historical fantasy romance arrives with the kind of creative team credentials that justify pre-premiere attention. Directed by Yoon Sung-sik — whose previous SBS period drama "Mr. Queen" became one of the network's highest-rated historical comedies — and starring BTOB's Yook Sung-jae, WJSN's Bona (Kim Ji-yeon), and Kim Ji-hoon, the drama positions itself at the intersection of supernatural romance, Joseon-era palace intrigue, and the sageuk genre's most recent evolution toward hybrid fantasy. Everything you need to know before the April 18 premiere is here.

The Premise: Possession, Shamanism, and a Palace Full of Ghosts

"The Haunted Palace" follows Yoon Gap (Yook Sung-jae), a royal archivist who becomes possessed by Gang-cheol, an Imugi spirit — a serpentine creature from Korean folklore that has not yet ascended to become a dragon and carries the spiritual weight of that unfulfilled transformation. The possession creates the drama's central romantic complication: Gang-cheol was also Yeo Ri's first love, meaning that the man Yeo Ri (Bona) falls for is simultaneously a person she has lost and the being that possessed the person now standing before her. The shaman heroine who must confront the supernatural is also the woman whose personal history is entangled with the supernatural figure she's fighting — a premise structure that gives "The Haunted Palace" a more emotionally complex setup than the average historical fantasy romance.

Yeo Ri, played by Bona, is a reluctant shaman — a character type that Korean fantasy drama has used productively across multiple genres, but which "The Haunted Palace" positions specifically within the Joseon palace context rather than the contemporary settings where reluctant shamans more typically appear. Her healing powers and complicated past with Yoon Gap/Gang-cheol make her the drama's emotional center: the story's supernatural premise requires her to navigate both the Imugi possession and the personal history that makes the situation unbearable in specific ways that pure monster-fighting would not generate. King Yi Seong (Kim Ji-hoon), a visionary monarch managing rising unrest and ghostly disruption at court, provides the political and institutional frame within which the supernatural and romantic plots unfold.

Why Director Yoon Sung-sik's Involvement Matters

Director Yoon Sung-sik is primarily responsible for the elevated expectation surrounding "The Haunted Palace" as a production. His previous SBS work, "Mr. Queen" (2020-2021), adapted the Chinese drama "Go Princess Go" into a Korean historical comedy through a gender-swap soul transfer premise — a structurally experimental choice that the production executed well enough to become a genuine ratings phenomenon, running consistently high for a Saturday-Sunday historical series in a competitive time slot. "Mr. Queen" demonstrated that Yoon Sung-sik can handle the tonal complexity that historical fantasy comedy-romance requires: maintaining emotional investment in characters who exist within a genre premise that could easily tip into parody.

"The Haunted Palace" requires a different tonal balance — more supernatural darkness, more emotional weight, more explicit horror elements drawn from the Imugi possession — but the structural challenge is similar: a genre premise that could become either moving or absurd depending on execution, directed by someone who has demonstrated the instinct to make the former choice rather than the latter. Writer Yoon Soo-jung, whose previous work includes "The King's Face," brings palace intrigue credentials that complement the supernatural elements Yoon Sung-sik will be staging visually.

The Cast: Two Idol-Actors at a Career Inflection Point

Yook Sung-jae's casting in "The Haunted Palace" is his first historical drama role since his acting debut — a detail that positions the production as something of a genre expansion for an actor whose previous drama credits have primarily been in contemporary settings. Yook Sung-jae is a member of BTOB, one of K-pop's most critically respected groups of the second generation, and his acting career has developed in parallel with his music career through a series of well-received performances. The Joseon-era context demands a different performance vocabulary — restrained physicality, period-appropriate speech patterns, and the ability to convey the dual identity of Yoon Gap-as-himself and Yoon Gap-as-possessed-by-Gang-cheol — and whether Yook Sung-jae navigates those demands effectively will be one of the drama's defining early performance questions.

Bona (Kim Ji-yeon) has been building her acting profile through a series of roles that have increased in scale and complexity across recent years. A lead role in "The Haunted Palace" at this point in her career represents the kind of promotional opportunity that an idol-turned-actor uses to make the case for sustained dramatic presence rather than guest status. The Yeo Ri role is complex enough — emotionally layered, physically demanding in the shaman ritual sequences the drama's premise implies, and structurally central to the narrative — that a strong performance would represent a genuine career advancement for Bona rather than simply an extension of existing profile.

What to Watch For Starting April 18

"The Haunted Palace" will generate its clearest success signals from its SBS domestic ratings in the Friday-Saturday 21:50 prime time slot — a competitive position where the drama will be measured against both its own expectations (given the director's track record) and the other available options at that hour. The drama's supernatural premise and Joseon palace setting position it for the K-drama international audience that has consistently responded to historical fantasy romance — a category that has produced some of the past five years' most globally distributed Korean television. Whether "The Haunted Palace" finds an audience that extends meaningfully beyond the domestic Korean viewership base will depend on whether the Imugi possession premise and the shaman-first-love emotional structure translate across cultural contexts without requiring specialist knowledge of Korean folklore.

The indicators to track in the drama's first two episodes — the April 18 and 19 broadcast — include the chemistry between Yook Sung-jae and Bona, the visual production quality of the supernatural sequences, and whether the dual-personality possession performance that the Yoon Gap role requires is established clearly and compellingly enough to sustain audience investment across sixteen episodes. Director Yoon Sung-sik's record suggests that "The Haunted Palace" will be executed with more craft than the historical fantasy romance genre typically receives; whether the premise itself is strong enough to make that craft matter fully is what April 18 will begin to determine.