SURVIVE. BUILD. PROVE.13 years of hands-on experience and results

By Gwak Du-palDoksaengMarketing.

Consulting and initial setup for Smart Store and Coupang sellers
I share what I have learned from selling, building and testing firsthand.

Marketplace Consultation See the results

THE KDP CYCLE03

KKnowledge: Experience to knowledge
DData: Knowledge to data
PPerformance: Data to results

My business failed.
Now I know how to survive.

Coupang & Smart Store sales increase: ₩583M; Jan–Sep 2026 vs. Jan–Sep 2025
Naver ad ROAS: 2,641%; Results from ads I managed
YouTube subscribers: 44,000; Experience and lessons recorded on video

Gwak Du-pal · Marketing built for survivalThe story after closing

01 / THE REASON I STARTED

I wish
scammers would disappear.

An agency scammed me when I ran my own business. I eventually closed during the pandemic. I know what it feels like to hesitate before spending on advertising again.

After closing, I learned to sell online and grew monthly sales on Coupang about 36-fold. I documented the trial and error on YouTube. Now I share 13 years of hands-on experience with other business owners.

Explore founder Kim Minjae’s records

FOUNDER’S ARCHIVEFILE / 01

2020.06.30

The day I closed my business.

Read my story

PUBLIC RECORDS

The channels I run and the tools I build

Select an image to inspect the operating record.

01 / PROFILE

Naver profile
Find my creator profile by searching for Gwak Du-pal on Naver.
View on Naver ↗
02 / CHANNEL

44,000 YouTube subscribers
I have published 233 videos on my own channel.
Watch a channel video ↗
03 / COMMUNITY

16,000+ community members
My Naver Cafe community recorded 16,413 members.
Visit the community ↗
04 / DEVELOPMENT

Tools I build with AI
I build image, video and document tools for sellers and marketers.
Try the free tools ↗
05 / SHOPPING CONNECT

Shopping Connect results

Cumulative sales
₩59.07 million

Estimated earnings
₩5.71 million

View the results ↗

Counts reflect the screenshots supplied by the founder and may change.

01 / REAL OPERATING RESULTS

Start with the evidence.
See the original records.

Results from businesses we operated ourselves.
See what changed and what it achieved.

Jan–Sep 2026 vs. Jan–Sep 2025

Sales growth by channel and product

Combined sales increase on Coupang and Smart Store

+₩583 million

View channel figures ↗

Coupang sales rose by about ₩444 million and Smart Store sales by about ₩140 million. Across all online channels, including those that declined, the net increase was ₩544 million.

Sales of an individual product

+242.4%

View product figures ↗

January–September sales rose from ₩14,760,890 to ₩50,548,520.

Rocket Growth transition

+4,378%

View Rocket Growth figures ↗

Rocket Growth sales rose from ₩868,000 to ₩38,867,600. In this case, combined Coupang sales reached 3.24 times the prior-year level.

The channel totals and individual cases cover different scopes. Figures are shown as reported in the source records.

COUPANG / DIRECT OPERATION

Monthly sales KRW 4.18M→ KRW 150M

About 36× growth

From Rocket Growth and marketplace operations to ads and SEO.
We improved the journey from product discovery to purchase.

BeforeKRW 4,184,900

Original Korean record: Coupang monthly sales of KRW 4,184,900 before growth

Enlarge original ↗

AfterKRW 150M

Original Korean record: Coupang monthly sales of KRW 150 million after growth

Enlarge original ↗

Monthly orders: 2,413
Monthly units sold: 5,230
Conversion rate: 6.77%

Ad efficiency2,641.46%Naver ad ROAS · revenue relative to ad spendView source records ＋

Naver ads · KRW 112,597,220 revenue ↗Coupang ads · 1,736.24% ROAS ↗

Search visibilityBlog · Naver CafeKeyword visibility from content we createdView source records ＋

Blog · barcode printer ↗Naver Cafe · Gasan Digital Complex gym ↗

Blog home feed428K viewsOne post · 1,224 likes · 159 commentsView source records ＋

One post · 428,319 views ↗Highest daily earnings · KRW 802,746 ↗

YouTube40,000+ subscribersThe Gwak Du-pal channel, operated directlyView source records ＋

40,000+ subscribers Watch video ↗Earlier subscriber record ↗New company long-form video · 16,657 views ↗

Figures are based on published operating records. Similar results are not guaranteed. Original evidence is in Korean.

02 / OUR CORE SERVICE

Online marketplace consulting.
What do we work on together?

For business owners planning to sell
on Smart Store, Coupang and other online marketplaces.

KDP CONSULTING / PRACTICAL SUPPORT FOR ONLINE SELLERS

From preparing to sell
to operations you understand.

We review your store and desired outcomes first. If we can take on the work, we provide one-to-one, in-person training followed by the initial setup.

Start with one monthThen choose freely whether to continue or finish.

Discuss marketplace consulting See the five-step process ↓

TRAINING & INITIAL CONSULTING

One-to-one, in-person trainingBefore initial consulting, learn how online marketplaces, advertising and promotion work.
Product setup & SEOSet up products and work on SEO for search visibility.
Advertising setupConfigure the basics for advertising on online marketplaces.
Blog & community setupSet up blogs and online communities for business advertising and promotion.
YouTube consulting & initial channel setupWe provide consulting for YouTube operations and set up your channel.
Website setup & search visibilitySet up your website and work toward better search rankings.

Need marketing execution or AI automation too?

Marketing execution

Support for ads, content, SEO execution and purchase conversion improvements.

Discuss marketing execution ↗

AI automation

Reduce repetitive work in content creation, product operations and data organization.

Discuss AI automation ↗Explore the tools we built ↓

THE KDP ARCHIVE REFERENCE

From branding and online sales growth
to performance marketing, blogs, communities and YouTube.

The work I have done.
The results I have built.

KDP INSIGHT / FOR BUSINESS OWNERS

A blog for your business.
Start with the right setup.

Running a business or brand blog? Start by reviewing the basic setup and settings of your Naver blog.

Watch on YouTube

Naver blog setup and settings for business owners Gwak Du-pal · Video in Korean

OUR COMMITMENT / YOUR BUSINESS, YOUR CONTROL

Doksaeng Marketing teaches you How to survive and stay in control.

We cut unnecessary costs and get your products and marketing channels set up quickly. Along the way, you build the understanding and skills to run your own business.

Set up your offer
Clarify your core product or service and lay the groundwork for selling.
Learn how marketing works
Understand advertising and promotion so you can decide which costs are necessary.
Build your store and channels
Put what you learn into practice with the initial setup of your store, blog, online community and YouTube channel.
Run it yourself or get affordable support
Manage your own business or delegate only the work you need help with.

We're changing costly services and difficult cancellations.

When you no longer need our managed services,you can cancel immediately.

Continuing with us is your decision.

Discuss your business needs

03 / THE CONSULTING PROCESS

From your first inquiry to completion,
five clear steps.

We review your request before confirming whether we can proceed.
Training comes first, followed by the initial setup.

CLIENT → KDP
Share your store and desired outcomes
Send your Smart Store, Coupang or other store details, along with the work you need help with and the outcomes you want.
KDP → CLIENT
Review and confirmation of whether we can proceed
KDP reviews your store and request, then lets you know whether we can take on the consulting work.
BEFORE INITIAL CONSULTING
One-to-one, in-person training
We explain how online marketplaces work and cover advertising and promotion. Initial setup begins after you understand the operating approach.
INITIAL CONSULTING
Set up your store and marketing channels
We work on product setup, SEO, ads, blogs and communities, website setup and improved search visibility. We also provide YouTube consulting and initial channel setup.
AVAILABLE FROM ONE MONTH
Choose whether to continue or finish
Consulting is available from one month. After that, decide whether to extend based on your business needs, or freely choose to finish.

Start by sending your store details and desired outcomes.

Send your store details

KDP TOOLS / BUILT FOR REAL WORK

Less repetitive work.
Tools we build.
Ready to use.

I build practical tools with AI to cut repetitive work. The image, video and document tools I use are available for anyone to try.

Try the tools we built Free to use, no sign-up · Opens in a new tab

KDP TOOLStools.kdpmkt.com

01 / IMAGE WORK

Image editor

Resize and watermark product and content images.

Open image editor 02 / CONTENT CREATION

Video → GIF

Turn the moments you need into animated images.

Open GIF tool 03 / PUBLISHING

Blog text formatter

Keep your content and improve line breaks and formatting.

Open text formatter 04 / DOCUMENT WORK

PDF converter & editor

Convert documents, merge PDFs and split files in one place.

Open PDF tools

Planned, built and used in real work.

Looping introduction GIF of Gwak Du-pal wearing a blue mask (Korean captions)

Gwak Du-pal · Founder Kim Min-jae

04 / ABOUT THE FOUNDER

After my business closed,
I learned to start again.

Over 13 years I have worked at large corporations, smaller companies and startups. I have run my own business, sold online, made YouTube videos and written a blog. Each role gave me a different view of the work.

Closing my business: I opened a space rental business in August 2017. An agency scammed me while I was running it, and I closed it in June 2020 during the pandemic.
Opening and closure dates (excerpt)

Inside the shop I ran

Window seat Tea canisters
Starting again online: I spent years studying marketplace sales and search visibility. I put blog and community search rankings, ad efficiency and YouTube channel growth to the test, and recorded the process on video.
Sharing what worked: I checked sales against Coupang records, ads against ROAS and content against search results. At Doksaeng Marketing, I bring those lessons to your store and channels.