Books by DK Group

Only those who know the terrain can command the machine

Author

DOYOUNG KIM

Language

English · Korean

Anyone can toss an AI a one-liner — “build me an app.” The trouble starts right after. To tell whether the path the AI takes is a shortcut or a cliff, you need a map of the terrain in your head. A 25-chapter map of modern software — frontend to agents — for people who command AI and need to verify it.

What you'll learn

• Frontend, backend, databases, deployment, and security
• Machine learning, transformers, LLMs, RAG, and AI agents
• Every region explained through “why it ended up this way”
• Written for non-developers and vibe coders

Buy

A Practical Guide for Intermediate to Expert Users

Author

DOYOUNG KIM

Language

English · Korean

A 24-chapter technical handbook for intermediate and expert users who want to move beyond casual prompting and build real, reliable systems on Anthropic's Claude. It covers the full surface — models, the API, tool use, agents, MCP, Claude Code, and production evaluation.

What you'll learn

• The Claude model family, tiers, pricing, and limits
• Prompt and context engineering, from basics to advanced
• The Anthropic API, tool use, and multi-agent workflows
• MCP, Claude Code, and production evaluation

Buy

Building, Connecting, and Selling a Self-Hosted Desktop

Author

DOYOUNG KIM

Language

English · Korean

A handbook for practitioners who want a server that runs on their own hardware rather than somebody else's cloud. It follows a self-hosted desktop server end to end — standing it up, connecting it so the outside world can reach it, and shaping it into something you can actually sell.

What you'll learn

• Building — standing up a self-hosted desktop server
• Connecting — making it reachable from outside
• Selling — turning a self-hosted stack into a product
• The companion volume to the DK-Server flagship product

Buy

How to Design, Build, and Operate Local LLMs and RAG on Your Own Infrastructure

Author

DOYOUNG KIM

Language

English · Korean

A comprehensive technical handbook on designing, building, and operating local LLMs and RAG on infrastructure you own — without sending your models or your data anywhere else. Written for organizations that cannot lean on external cloud APIs because of security, regulation, or data sovereignty.

What you'll learn

• Design — architecting on-premise LLM and RAG systems
• Build — model serving and retrieval pipelines on your own hardware
• Operate — keeping it running once real work depends on it
• A self-contained setup that never ships your data outward

Buy

Reconstructing Real Space from Photos & Video

Author

DOYOUNG KIM

Language

English · Korean

A complete technical white paper on 3D Gaussian Splatting — from the origins of novel view synthesis to production systems. It traces how the field arrived — photogrammetry, structure-from-motion, and NeRF — then builds 3DGS from the ground up: the anisotropic Gaussian, spherical harmonics, and the differentiable tile rasterizer, the reconstruction pipeline, and everything after.

What you'll learn

• Origins — novel view synthesis, photogrammetry, and SfM
• The core of 3DGS — Gaussians, spherical harmonics, tile rasterizer
• Quality, compression, large scenes, and 4D dynamics
• Generative 3D and applications shipping today

Buy

V3, and Thirty Years of Korean Cybersecurity

Author

DOYOUNG KIM

Language

English · Korean

At 3 a.m., a young medical researcher found a signature he had never seen in his own floppy disk's boot sector: (C)Brain. He was a doctor, not a programmer — so he wrote a cure and called it Vaccine. That program became V3. The thirty-year arms race between viruses and the defenses built to stop them — from a 1988 boot sector to a six-layer platform.

What you'll learn

• From Vaccine to V3 — the founding, the growth, the departure
• Brain, CIH, Slammer, Stuxnet, the March 20 attack, WannaCry
• Signatures → heuristics → behavioral detection → EDR
• Seven Deep Dives — viruses, botnets, the APT kill chain, sovereign security

Buy

The Hacker's Ladder, Book One — Cybersecurity from Zero

Author

DOYOUNG KIM

Language

Korean

A book for people who want to learn hacking but have no idea where to start. It does not teach attack techniques. It shows you where attacks become possible in the first place. Files and processes, IP and ports, HTTP and DNS, variables and databases, encryption and authentication — it establishes how a computer actually works, then explains why vulnerabilities arise on top of that. Eighteen chapters, one rung at a time: one chapter a day, three weeks.

What you'll learn

• Eighteen chapters from the computer to the internet, code, security, and hands-on practice
• Every chapter ends with “so what does this have to do with hacking?”
• A safe practice lab built inside an isolated virtual environment
• Book One of The Hacker's Ladder — one chapter a day, three weeks

This book is intended for information-security education. Practice only on systems you own or have explicit permission to test; unauthorized access to systems may violate the law.

Buy

The Hacker's Ladder, Book Two — Reproducing Web Vulnerabilities in a Local Lab

Author

DOYOUNG KIM

Language

Korean

Book One covered the computer and the network; this one is about the web. It does not merely explain vulnerabilities — it has you reproduce them on your own machine. Nineteen chapters all move in the same order: principle → detection → reproduction → defense, and every exercise stays inside an isolated local lab. You start by standing up a Linux guest VM and Docker targets, inspect requests through a proxy, confirm by hand why vulnerable code is vulnerable, and then write the code that closes it.

What you'll learn

• SQL injection, XSS, and command injection
• Authentication and session flaws, CSRF, and IDOR
• Path traversal, file upload, and SSRF
• Nineteen chapters of principle → detection → reproduction → defense

This book is intended for information-security education. Practice only on systems you own or have explicit permission to test; unauthorized access to systems may violate the law.

Buy

The Hacker's Ladder, Book Three — Finding Them Yourself, with No Answer Key

Author

DOYOUNG KIM

Language

Korean

Following a vulnerability someone else found is a different job from finding one yourself. Where Books One and Two were about understanding known vulnerabilities, this one is about discovering the ones nobody knows yet. Eighteen chapters cover eight fundamental methods — and finding is not the end of it. Building a reproduction environment, validating your own PoC, and reporting through responsible disclosure are part of the same package.

What you'll learn

• Attack surface reconnaissance and reachability analysis
• Sink-first source code audit, CVE ecosystems, and patch diffing
• Sibling surface hunting, fuzzing, parser differentials, and logic flaws
• Validating your own PoC and the coordinated disclosure (CVD) process

This book is intended for information-security education. Practice only on systems you own or have explicit permission to test; unauthorized access to systems may violate the law.

Buy

A Forensic AI Thriller — Book One

Author

DOYOUNG KIM

Language

English

A forensic AI auditor finds a seam in an unhackable machine's verdict — and an innocent man's clock is running out. A thriller about the gap between a system everyone trusts and the reasoning it actually performed.

What you'll learn

• Auditing the seam in an “unhackable” system
• Forensics that treats the inference itself as evidence
• Proving innocence against a running clock
• A technical thriller in three parts

This is fiction — Book One of the Forensic AI Thriller series, where the story begins. It continues in The Ground Truth Protocol.

Buy

A Forensic AI Thriller — Book Two

Author

DOYOUNG KIM

Language

English

Someone edited the one record the whole country measures truth against — and the only proof left was never written down. A forensic AI thriller about what you can still prove when the standard of measurement itself has been compromised.

What you'll learn

• Forensics at the moment the reference record is altered
• An investigation that must doubt its own yardstick
• Building a case on proof that was never recorded
• A technical thriller in three parts

This is fiction — Book Two of the Forensic AI Thriller series. It completes the story begun in The Inference Room, which we recommend reading first.

Buy

A LitRPG Apocalypse

Author

Marcus Hale

Language

English

A grounded LitRPG apocalypse — a hotel that became a keep, and the night auditor who kept its books. Survival here is not a matter of flashy stats but of records, arithmetic, and who still bothers to balance the ledger.

What you'll learn

• The hotel that became a keep, and the order inside it
• An apocalypse seen from the night auditor's desk
• LitRPG that keeps its feet on the ground
• An apocalypse narrative in three parts

This is fiction, published under the pen name Marcus Hale.

Buy