Korean Whodunit
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4 CASE FILES OPEN · 사건 수사중 · SPEECH LEVEL SLIP DETECTED · 존댓말→반말 CONTRADICTION · VERBAL FINGERPRINT MATCH · 언어가 증거다 · GRAMMAR IS THE CLUE · 4 CASE FILES OPEN · 사건 수사중 · SPEECH LEVEL SLIP DETECTED · 존댓말→반말 CONTRADICTION · VERBAL FINGERPRINT MATCH · 언어가 증거다 · GRAMMAR IS THE CLUE ·  
Badge #0417 · Assigned To You

Crack the case. Master

한국어.

A body. A locked room. Texts in Korean that don't line up. You're the detective — press the suspects, pull apart the alibis, and let the grammar point at the killer. Learn real Korean by catching someone in the act of lying.

Crack Your First Case →
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Hangul Basics FREE
Red-Stained Script FREE
Diplomat's Cipher 🔒
Forged Will 🔒
No Sign-Up Required · Click A Word. Catch A Contradiction.
Burner Phone · 11:15 PM
지금 가요. 방에서 기다려.
← click 가요 to pull the thread
UNDER INVESTIGATION · ~잖아 CONFRONTATIONAL SUFFIX · 반말 CASUAL SPEECH · 존댓말 FORMAL SPEECH · 범인 찾기 · LANGUAGE CATCHES KILLERS · UNDER INVESTIGATION · ~잖아 CONFRONTATIONAL SUFFIX · 반말 CASUAL SPEECH · 존댓말 FORMAL SPEECH · 범인 찾기 · LANGUAGE CATCHES KILLERS ·  
How It Works

You're not studying. You're working the file.

Traditional apps teach vocabulary in isolation. Here, every Korean word is a clue — and misreading one means the killer walks free.

01
English Interface

The Narrative Is in English

The case briefing, your partner's analysis, and the detective interface are all in English. You're never lost — you're always in control of the story.

02
Korean Evidence

The Clues Are in Korean

Intercepted texts, diary entries, corporate emails, voice transcripts — all in Korean. Click any word to reveal its meaning. Your partner explains the grammar behind the lie.

03
Linguistic Proof

Prove It With Language

Naming the killer isn't enough. You must identify the specific linguistic contradiction that proves guilt.

2,400+
Active Detectives
89%
Finish first case in one sitting
4.8★
Early Access Rating
Zero
Boring Drills
★★★★★
"I've tried Duolingo, Pimsleur, and three tutors. I learned more about Korean speech levels in one hour here than in six months elsewhere."
— Priya M., software engineer
★★★★★
"The ~잖아 mechanic completely changed how I listen to Korean drama. I caught the same pattern in a real episode the next morning."
— James L., intermediate learner
★★★★★
"I teach Korean at university. I'm recommending this to every student who struggles to see why grammar matters."
— Dr. Sarah K., Korean instructor
Open Case Files

Pick a file off the desk.

Tutorial · Free
Learn to Read Korean
한글 기초
20 MIN
The Korean alphabet in 20 minutes — taught through the vocabulary you'll need for every case.
Case 001 · Free
The Red-Stained Script
빨간 대본
45–60 MIN
A K-Drama director found dead. A suicide note on his laptop. But the Korean grammar doesn't add up.
Case 002 · Premium
The Diplomat's Cipher
외교관의 암호
60 MIN
CLASSIFIED
An ambassador dead in a locked embassy. One word in a recording shouldn't be there.
Case 003 · Premium
The Forged Will
위조된 유언장
60+ MIN
CLASSIFIED
A billionaire's will rewritten overnight. Native Koreans don't make that synonym choice. Ever.
존댓말 / 반말 — Speech Level Mechanic
Burner phone text to Director Park · 11:15 PM
지금 가요. 방에서 기다려.
가요
Formal ~요 ending — used with strangers or superiors
기다려
Bare casual command — used with close friends or family
✗ Same message. Two speech levels. The mask slipped.
What Makes This Different

The grammar is the evidence.

Other apps teach grammar as abstract rules. Here, grammar contradictions are what puts a suspect at the scene.

01

Speech Level Slips

Switching between formal and casual Korean in one sentence exposes a disguised relationship.

02

Verbal Fingerprints

A ~잖아 pattern in someone's emails, matched to a "suicide note," is as distinctive as DNA.

03

Partner Analysis

Your linguistics partner breaks down every clue in plain English — you learn the grammar by watching it catch a killer.

Membership

Unlock all cases.

The first case is free. Upgrade when you're hooked.

Detective
Free
No credit card needed
✓ Hangul Tutorial
✓ Case 1: The Red-Stained Script
✓ Partner analysis system
✓ Case Notebook
✗ Premium cases
Most Popular
Senior Detective
$6/month
or $42/year — save 40%
✓ Everything in Free
✓ All premium cases
✓ New cases monthly
✓ Dialect & idiom deep-dives
✓ Vocabulary flashcard mode
FAQ

Questions from the case files.

Korean Whodunit

Learn Korean through high-stakes murder mysteries. Traditional apps give you drills. We give you crime scenes.

Cases

Tutorial — 한글 기초 Case 1 — 빨간 대본 Case 2 — 외교관의 암호 Case 3 — 위조된 유언장

Learn

Hangul Guide Speech Levels Grammar Clues (~잖아) Honorifics

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