About Us

We grow rapidly with a big and bold vision.

ST Unitas started in 2010 as an EduTech company with only 4 employees.
It earned the nickname “The Fastest Rocket in Korea” by growing into a company with over 1,200 employees within six years and becoming one of the top global companies in EduTech.


“Can the underprivileged 99% receive the same opportunities given to only the blessed 1%?”
We believe that everything we create can provide the opportunity to change someone's life.

ST is an abbreviation of ‘Sling sTone’ which David used in his battle to defeat Goliath.
We have been creating numerous educational contents which act as sling stones. We not only perform with a sense of duty and pride but also create innovative contents with the intent of building a company that can make the world a better place.

Our definition of a great company is not a profitable company, but a company that has great and bold visions and is willing to take risks in order to achieve that vision. We oftentimes need to look beyond profit-seeking to create a better world. Achieving such visions requires cooperation with other companies who share the same vision as well as non-profit organizations, social enterprises, governments, and global organizations. We aspire to achieve great goals with partners who share our vision.

We intend make the world a better place through our innovative solutions.


  • 2019.03

    Launched 'CONECTS' app for the nation's No.1 study app (Beta version)

  • 2018.12

    CONECTS, “2019 Korea First Brand Awarded 'Grand Prize' for the 2nd consecutive year

  • 2018.01

    Launched 'Stella', an artificial intelligence education service

  • 2017.08

    Launched Global Knowledge Platform ‘CONECTS’ (Beta version)

  • 2017.05

    ST Unitas ranked 1st in Branding Customer Loyalty Survey 'Education Group'

  • 2017.02

    Acquired The Princeton Review

  • 2016.07

    Sponsored online educational contents for juveniles under protection through the ‘School of Hope’ which is operated by the Uijeongbu District Court / Selected as “Venture KRW 100 billion Club” by SMBA (Small and Medium Business Administration) and KOVA (Korea Venture Business Association)

  • 2016.05

    Changed company name to ST Unitas

  • 2016.04

    Acquired Internet Bookstore Libro

  • 2016.03

    Acquired Korean Public Servant Academy

  • 2015.12

    Acquired Unitas Brand

  • 2015.11

    Named “Best Company to Work For 2015” (2nd consecutive year)

  • 2015.10

    Took over Beauty LeSha (MBC Academy Beauty School, Snooty Brush) / Launched PEETdangi (Pharmacy Education Eligibility Test) and MDdangi (Medical Education Eligibility Test & Dental Education Eligibility Test)

  • 2015.07

    Opened Gongdangi (Public Office Services) Busan Academy

  • 2014.12

    Named “Best Company to Work For 2014”

  • 2014.10

    Acquired SKYEDU (University Entrance Exam)

  • 2014.04

    Became one of top 100 job creators (Received a Presidential Citation)

  • 2013.01

    Opened Engdangi (TOEFL, TOEIC, GRE, GMAT, etc.) Gangnam Academy

  • 2012.08

    Gongdangi (Public Office Services) attendance reached #1 nationally

  • 2011.11

    Launched Gongdangi (Public Office Services)

  • 2010.11

    Launched Engdangi (TOEFL, TOEIC, GRE, GMAT, etc.)

  • 2010.04

    Established ST & Company

  • Sales Growth

  • Number of Employees


  • Sung-hyuk Yoon

    Founder and CEO, Mr. Yoon graduated at the top of his class from the College of Engineering at Seoul National University and worked for Bain & Company. He envisioned to narrow the gap between the rich and the poor through education globally and realized his dream through innovation with the help of his outstanding colleagues at ST Unitas. He strongly believes that all contents created by ST Unitas will provide opportunities in changing the lives of others.