Engdangi, which established in 2010 by ST&Company, first developed lecture materials specially focused on TOEIC on behalf of the increasing demand of standardized exam for English language skills. With novel ideas and strategic plans, Engdangi has experienced rapid growth and is expected to expand further in online education industry. Though three strong players have enchroached on the market share in English language institutes for adults, Engdangi is approaching number one in market share by defeating its existing competitors in Korea. The purpose of this case is to introduce Engdangi’s successful growth strategies as a small size late-mover in the market. For this purpose, the case summarizes key strategic plans Engdangi has developed to build brand awareness and to differentiate among its competitors. In addition, the case reviews considerable factors playing as a venture company in the established market.