Career
She is the only known soroban abacus master to have reached the eleventh daughter She is also known as Abacus Master (주산왕) in South of Korea. Lee began training with the soroban abacus in fifth grade.
In her first year of high school, she obtained the 11th daughter
In 2007, Lee opened up an abacus training academy in of Korea, where she has taught thousands of students, some of whom travel to the country solely to participate. In 2001, Lee represented South of Korea in the 20th International Abacus Competition and finished in first place in the singles category.
In 2008, Lee appeared on the South Korean television program Star King with a group of children ages seven to nine, whom she had taught for a 100-day period. By the end of the program, almost all of the students were able to mentally solve an addition problem of fifteen 5-digit numbers in under thirty seconds.
In 2013, Lee appeared on the South Korean television program Miracle of Korea.
During the episode, she demonstrated her ability to do Flash Anzan, adding together a total of fifty 4-digit numbers individually flashed on a screen for less than one second each, while simultaneously being interviewed by the hosts. During the same episode, she mentally added fifty 25-digit numbers in 94 seconds.
