Business & Economics

Sales Prism

For the Hardworking Fool in Sales

Author 이재희

Publisher 리브레토

Published Mar 16, 2026

Pages 324 pages

Size 145×200mm

ISBN 9791190917285

Price 21,000 KRW

You come in earlier and leave later than everyone else—so why are your numbers stuck in place? Why does a single word of rejection from a customer leave you shattered? For the 'diligent fool' who runs hard but without direction, the report card that comes back without fail reads: 'first in line to b…

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"The customer doesn't even know what their own problem is."

The textbook sales formula that companies demand can be summed up in three words: 'Be diligent—be kind—be persistent.' Yet even those who possess all three in equal measure find it hard to become an ace—such is the nature of sales. There are people who run hard and still see their numbers frozen in place, and people who lie awake at night because a single word of rejection from a customer feels like a denial of their very existence. If you've been asking yourself, "Why doesn't it work, no matter how hard I try?", then it may be time to look back and ask whether you've been a 'diligent fool' all along.

An English literature student who had studied Shakespeare, the author began his working life as a salesman for household goods, and to overcome his own limitations he made diligence his weapon. He came in earlier and left later than everyone else, but for a 'diligent fool' who only ran hard without direction, the report card that came back without fail read: 'first in line to be let go.' Living through the moment when a store owner, enraged over a single tax-invoice error, hurled an envelope that grazed past barely a hand's width from his face, he learned in his bones that neither theory nor moving words carry any power in the field. The turning point that took the author from the edge of the cliff to becoming the nation's number-one sales champion was simple. After realizing that the essence of sales is not 'selling' but 'solving' the customer's problem, the author redesigned his own system from the ground up.

This book refracts that redesign process through five prisms: the Partner's perspective that spots the customer's problem first (P), the Resilience that converts rejection into data rather than emotion (R), the Information mastery that shrinks two hours of busywork into thirty minutes (I), the System that takes command of the density of time (S), and the Mastery that turns a niche into a golden egg (M). But these five are not laid out in the stiff format of a management textbook. By drawing the reader into the real on-the-ground stories the author actually faced, the book lets readers reflect on their own sales work and discover the lessons for themselves. If, while reading the stories, you find yourself wondering, "Which of the PRISM elements is this talking about?", you'll be able to picture concretely how to apply it to your own sales.

The appendix is the part you can put to use as your most immediate weapon. It contains, in their entirety, the sales prompts the author uses in actual practice. Give a sloppy command like "Write me a proposal" and the AI will serve up nothing but predictable answers. A true professional gives the AI different instructions from the very first command. Here is a way of using AI that shakes off the busywork nagging at you like a 'grain of sand in your shoe' and lets you be reborn as a true professional. To save two hours a day and spend that time solely on meeting people and winning their hearts—that is the real sales of the future that this book speaks of.

Even in the age of AI, some things will not change. It is a person who stands before the customer, a person's eyes that spot the problem, and a person's attitude that builds trust. PRISM—completed over twenty years of facing the field, from being first in line to be let go to becoming the nation's number-one sales champion. Are you ready to become the professional who spots the customer's problem first?

Prologue

Chapter 1. What Are You Selling For?

Chapter 2. Finding Your Own Strengths Within the Rejection of "No Thanks"

Chapter 3. Four Time Strategies for Escaping the Diligent Fool

Chapter 4. True Desperation Knocks on the Door Again and Again

Chapter 5. How to Find, Create, and Flip a Niche

Chapter 6. The Three-Step Formula That Turned a Thankless Burden into a Golden Egg

Chapter 7. Move First, Build Trust, Prove Your Value

Chapter 8. The Art of Repairing Relationships

Chapter 9. How to Turn Gifts into Die-Hard Fans

Chapter 10. How to Build and Keep Trust

Chapter 11. The Art of Persuasion You Can't Refuse

Chapter 12. Discounts Are a Drug: The Art of Selling on Value

Chapter 13. The Art of Negotiation That Turns No into Yes

Chapter 14. Beyond the Individual, to the Team

Chapter 15. The Leadership That Moves a Team

Chapter 16. The Collection Principle Proved by a Single Bottle of Yogurt

Chapter 17. Earning Two Hours a Day with the AI Avengers

Appendix. Design Your Salesperson AI with PRISM

Epilogue

He started out as a salesman for household goods, and in his third year with the company he found himself at the edge of a cliff—first in line to be let go. But after realizing that the essence of sales is not 'selling' but 'solving,' he redesigned his own system and, in his sixth year, rose to become the nation's number-one sales champion.

Over fourteen years inside organizations and six years out on his own—twenty years of field experience in total—he added the systems thinking of an Engineer Information Processing (정보처리기사) certification and the practical knowledge of a Level-1 Distribution Manager (유통관리사 1급) certification to complete his own original P·R·I·S·M system. Through this system, he helps countless salespeople break free of the busywork that nags like a 'grain of sand in the shoe' and be reborn as true professionals.

Today he works as the head of a one-person logistics brokerage and as a sales strategy consultant.