David (Joonseok) Lee
Business Development Manager & Growth Operator
I build new revenue channels through partnerships, manufacturing projects, e-commerce growth, and cross-cultural market expansion. Based in South Korea, I bring experience across K-beauty, manufacturing, e-commerce, and esports.
Proof of Impact
Key achievements across manufacturing, e-commerce, and esports.
Secured and managed a beauty device manufacturing partnership
Launched OEM production from contract drafting to mass production
Developed and optimized a K-beauty Amazon Seller account
Pioneered Korean coaching in the Turkish League of Legends scene
About Me
Business builder connecting people, products, and markets.
Who I Am
Business Development Manager based in Cheonan, South Korea. I build new business channels by connecting people, products, and markets.
What I've Done
Manufacturing partnerships that generated USD 5M+ in revenue, B2C/B2B e-commerce development, Amazon seller optimization, and professional esports coaching across Korea and Turkey.
What I'm Looking For
Business development opportunities, partnership, publishing, and service strategy roles in gaming, technology, manufacturing, or global commerce.
Currently a Business Development Manager at ID SYSTEM, where I identify new revenue opportunities, build partner relationships, and turn early-stage ideas into executable business projects. I manage sales channels with COWAY and ECODMLAB, oversee manufacturing projects, and help create new revenue streams.
Best Fit Roles
Featured Work
Problems I've solved and the value I've created through strategic business development.
ECODMLAB OEM Manufacturing Partnership
ID SYSTEM needed new growth channels beyond existing business to drive significant revenue expansion.
Identified ECODMLAB as a potential manufacturing partner, initiated meetings for beauty device OEM production, supported contract drafting, and managed production from PP stage to mass production.
Generated KRW 1.5B / USD 1M in 2024 revenue contribution. Supported company growth from KRW 6.8B (2023) to projected KRW 20B (2026). Total USD 5M+ revenue contributed as of 2026.
Amazon K-Beauty Growth
hummingavis needed to develop B2C sales channels in the U.S. market for their K-beauty product line.
Built and managed Amazon Seller operations from scratch, developed PPC campaigns, finalized B2B partnerships with Therabox, Ecoren International, YesAsia, and White Edge.
Improved ROAS above 3.0, reaching 6.5 at peak. Led hero product into top 20 best-selling products in its Amazon U.S. hair care category. Marketing partnerships drove organic sales growth.
Esports Market Development
Blizzard Entertainment's Overwatch IP's esports scene needed solutions to stimulate growth. Turkish LoL teams needed Korean expertise.
Advised Akshon Esports in developing consumer-centered technological solutions. Coached three professional teams in Turkey, bridging Korean players and coaching methodologies into the Turkish scene.
Assisted Akshon Esports in developing products and services for organizations including T1 and Blizzard Entertainment. Became the first Korean coach in Turkish League of Legends, helping teams improve competitive performance.
Work History
Professional experience in business development and growth.
Business Development Manager · ID SYSTEM
- Discovered ECODMLAB in July 2024 and initiated beauty device OEM production partnership.
- Drafted production contract and managed new products from PP stage to mass production.
- Managed production projects: V1 (Quadthera Original), M1 (Minitune), T1 (Titan), PS1 (Pearl Shot), F1 (Pre-launch).
- Manage sales channels with COWAY and ECODMLAB.
Business Development Junior Manager · hummingavis
- Developed company's Amazon Seller Account for B2C K-beauty products.
- Finalized marketing contract with Therabox U.S. subscription program.
- Finalized B2B sales contracts with Ecoren International (Taiwan), YesAsia, and White Edge (Malaysia/Guardian).
- Led PPC advertising campaigns for K-beauty hair care products.
Core Competencies
Skills developed across business, technology, and cross-cultural environments.
Business Development
Manufacturing / Operations
E-commerce / Marketing
Technology / Creative
Languages / Cross-cultural
Life Experiences
The experiences and moments that shaped who I am today.
Early Childhood
Born in Istanbul into a family of five children. Spoke Turkish daily, learned in English at school, and communicated in Korean at home.
- Played lead roles in two musicals in Hungary
- Developed lifelong love for basketball
- Participated in volunteer activities including gypsy ministry work
Esports Journey
Began professional esports career as a journalist, then became the first Korean coach in the Turkish League of Legends scene.
- Organized collegiate esports events
- First Korean coach in Turkish LoL
- Brought Korean players into Turkish scene
College
Enrolled in U.S. & International Law while double majoring in Counseling Psychology. Gained exposure to startups and professional communication.
- Graduated with a 3.58/4.5 GPA
- Interned at Venture Port and worked at Akshon Esports
- Won "Best Mooter" and "Best Defendant" at IHL Moot Court
Volunteer Work
Believe all people share the same dignity and needs. Helping our neighbors is part of building a healthier community.
- Helped Tammy reconnect with her rescuer
- Assisted children with learning disabilities
- Shared music with children at an orphanage in Paju
Let's Work Together
I'm currently exploring business development, partnership, and service/business strategy roles where I can combine my esports background, manufacturing experience, and cross-cultural communication skills.