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BYTHEQUALITY
Prof. & CEO
Sanghyun Kim
Message from the CEO
Since 1996, I have been teaching estheticians with the hope that they would develop a stronger sense of pride and professionalism in their work.

As I continued to provide education on skin, cosmetics, and consultation techniques, I came to recognize that professional skincare products are an essential part of esthetic practice. This realization led me to begin developing cosmetics in 2007.

To create products that truly reflected my philosophy and standards, I established NJ Coslab Co., Ltd. and launched BYTHEQUALITY in May 2022 as a dermacosmetic brand specializing in solutions for problematic skin.

BYTHEQUALITY was created to offer confidence and hope to consumers suffering from skin concerns by supporting their journey toward healthier skin.

At the same time, we hope to help estheticians achieve more effective clinical results, strengthen their confidence in their profession, and find greater fulfillment in the work they do each day.

Together with every member of BYTHEQUALITY, I sincerely hope that our brand will contribute to both healthier skin and a more rewarding professional future for estheticians.

To fulfill this commitment, BYTHEQUALITY promises to provide not only effective and safer products, but also comprehensive product education, marketing education, and practical systems that enable estheticians to better support clients with problematic skin.

Thank you.
Cosmetics
  • Dermacosmetic Brand Founder, Developer & CEO of BYTHEQUALITY, Clinical Answers for Estheticians
  • NJ COSLAB Co., Ltd. Responsible Cosmetics Distributor
Social Media
  • Instagram @ping.pi.bak_kim_sanghyun
  • YouTube Search for “핑피박 (Ping Pi Bak)” on YouTube
  • Naver Café Search for “김상현피부교수” on Naver Café
Education
  • Chung-Ang University | M.S. in Cosmetic Science, Department of Food and Drug Administration, Graduate School of Food and Drug Administration Master’s Thesis: Effects of Physical Skin Barrier Damage on Reduced Stratum Corneum Hydration and Winter Pruritus
  • Soongsil University | Ph.D. in Business Administration, Department of Business Administration, Graduate School Major in Marketing Doctoral Dissertation: The Effects of a Messenger’s Social Distance, Source Credibility, and Message Sidedness on Persuasion
Education
  • Skin Concert: Problematic Skin, Client Consultation, Esthetic Marketing, and More Edu Consulting +82 10-5096-0285
  • Customized Cosmetics Preparation Manager Course Personal Cosmetics Online Course +82 31-211-9171
  • Adjunct Associate Professor, Department of Medical Beauty, Chung Cheong University Skin Science, Skin Nutrition, Anatomy and Physiology, Beauty Business Management, and Cosmetic Science
  • Visiting Professor, Department of Korean Medicine and Beauty Arts, Wonkwang Digital University Skin Science, Korean Herbal Cosmetic Science, Beauty Business Management, and Consultation Techniques
  • Visiting Professor, Department of Beauty Arts, Soongsil Cyber University Cosmetic Science and Beauty Marketing
  • Formerly, Total Beauty Program, Continuing Education Center, Sahmyook Nursing and Health College Visiting Lecturer
  • Formerly, Master’s Program in Biotherapy, Graduate School of Health and Welfare, CHA University Visiting Lecturer
  • Formerly, CEO Program and National Certification Program, Continuing Education Center, Sookmyung Women’s University Visiting Lecturer
  • Formerly, LG Household & Health Care, Hanbul Cosmetics, Amorepacific, L’Oréal, Biotherm, and La Roche-Posay Corporate Lecturer
  • Formerly, LG Household & Health Care Cyber Academy Video Lecturer
  • Formerly, Online Skin Care Program, Wonik Co., Ltd. Skin Care Theory Lecturer
  • Formerly, Hospital Coordinator Program Small Business Promotion Agency
  • Formerly, Beauty Academy Korea Health Industry Development Institute
  • Formerly, Small Business Management Improvement Program Small Business Promotion Agency
  • Formerly, Esthetic Salon Employment and Entrepreneurship Program for Women Returning to the Workforce Women’s Development Institute
Publications
  • Fascinating Stories About Skin Hakjisa / Sole Author / 2005
  • Conquer Acne in 8 Weeks Hakjisa / Co-authored by 2 Authors / 2008
  • All-in-One Guide to Passing the Customized Cosmetics Preparation Manager Certification Exam Hakjisa / Lead Author / 2020
  • National Technical Qualification Exam for Estheticians: Essential Review, Revised Edition Jungdam Media / Co-authored by 11 Authors / 2007
  • National Technical Qualification Exam for Estheticians: Practice Test Questions, Revised Edition Jungdam Media / Co-authored by 11 Authors / 2007
  • Complete Guide to the National Technical Qualification Exam for Estheticians Areumdaun Uri Publishing / Co-authored by 4 Authors / 2007
  • Esthetician Iljinsa / Co-authored by 4 Authors / 2008
  • Practical Skin Care Salon Management Hyunmoonsa / Co-authored by 4 Authors / 2009
  • Cosmetic Science Hyunmoonsa / Co-authored by 15 Authors / 2010
  • Medical Esthetics Hyunmoonsa / Co-authored by 9 Authors / 2014
National Certifications and Licenses
  • Customized Cosmetics Preparation Manager Ministry of Food and Drug Safety / 2020
  • Level 2 Lifelong Educator Certificate Ministry of Education / 2022
  • Cosmetologist License 1998
Registered Private Certifications
  • Practical Cosmetics Consultation Specialist
  • Esthetic Consumer Consultation Specialist
  • Esthetic Business Management Specialist
  • Self-Skin Care Consultation Specialist
Media Appearances
  • Professional Training Project “Follow Your Dream” – Esthetician Episode MBC
  • Kim Eo-jun’s News & Joy SBS Radio
  • Cosmetics & Beauty Consultant LG Home Shopping
  • Beauty Science YTN