| Native Title | 남주의 첫날밤을 가져버렸다 |
| Also Know as | I Took the Male Lead's First Night, Namjuui Cheotnalbameul Gajeobeoryeodda |
| Director | Lee Woong-Hee |
| Writer | Jeon Sun-Young |
| Distributor | KBS2 |
| Air Time | Wednesday, Thursday 21:50 |
| Content Rating | 15+ - Teens 15 or older |
| Runtime | 12 episodes |
| Genre | Historical, Comedy, Romance, Fantasy |
| Language | Korean |
| Country | South Korea |
| Release Date | 2025-06-11 |
| End Date | 2025-07-17 |
“The First Night with the Duke” (native title: “남주의 첫날밤을 가져버렸다”) is a 2025 South Korean fantasy-romance drama starring Seohyun (Girls’ Generation) as Cha Seon‑chaek and Ok Taec‑yeon (2PM) as Yi Beon. Airing on KBS2 from June 11 to July 17, it spans 12 episodes, released Wednesdays and Thursdays at 21:50.
A modern-day college student (known simply as K) finds herself transported into her favorite historical romance novel – not as the heroine but as a minor noblewoman, Cha Seon‑chaek.
Her quiet, sideline plan quickly unravels when she unwittingly spends a night with the brooding male lead, Yi Beon, a royal prince. This one event flips the original novel’s narrative.
Now, Seon‑chaek must juggle steering the story back on track while navigating unexpected romantic feelings.
Includes Kwon Han‑sol (Jo Eun‑ae, the original heroine), Seo Bum‑june (Jung Soo‑gyeom), Ji Hye‑won (Do Hwa‑seon), and more.
Adapted from Hwang DoTol’s hit web novel/webtoon, boasting over 113 million views online for its gripping tale.
Directed by Lee Woong-hee, written by Jeon Seon-young, and elevated by Gaemi’s evocative soundtrack.
Set in a vague Joseon era, featuring detailed costumes, historically-inspired hairpieces, and faithful set designs with minimal CGI for seamless time transitions.
Comic relief shines through Seon-chaek’s modern quips, like “Where’s my iced americano?”, cleverly delivered in period language for a playful twist.
The premiere earned strong ratings: 3.3% nationwide, jumping to 3.4% by episode 2 – boosting KBS2’s slot performance.
By episode 6, it topped competing shows in its time slot, dominating network TV on June 26 with a 3.3% average and a 3.4% peak in Seoul.
Viewers praised the chemistry between Seohyun and Taec-yeon, especially the tension-filled flashbacks and melodramatic moments.
Dramacaps praised "The Murky Stream" as a “delightful isekai romance,” blending meta-commentary with genuine emotional beats.
Some critiques noted weaker elements: a passive heroine at times, a formulaic soundtrack, and a finale heavy on filler – suggesting it may be more appealing to fans of the leads.
If you enjoy light-hearted isekai romance, modern humor in historical settings, and charismatic leads, this series is a compelling binge. Seohyun and Taec‑yeon’s chemistry carries the show, backed by enchanting visuals and clever genre awareness.
Aired on KBS2.
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