In December 2024, Forbes estimated his net worth at US$1.3 billion and ranked him 25th richest in the country.
Lee received his bachelor's degree in computer science from Seoul National University and earned a master's degree from the Korea Advanced Institute of Science and Technology.
In June 1999, Lee established Naver.com and its main product was the search engine, Naver.
Naver started as a search engine but quickly expanded its services to include web portals, online communities, e-commerce platforms, and mobile applications.
Line is a instant messaging app that was developed by Naver and launched in 2011.