Gallup Korea elected three legends of KPop.
It is not necessary to recount its history.
Suffices to say that
16 Weeks at #1 in Billboard Hot 100
Best selling album of the world in 2020
Entrance to UN Headquarters
Entrance to the White House
First stadium concert tour around the world by a KPop act
2. Cho Yongpil
At his heyday Japanese stadiums were not open to non-Japanese, non-Western singers.
#1 singer in Korea, 1981, 1983, 1984, 1985, 1986, 2013
4 appearances in the NHK Kohaku show, 1987-1990
By the standard of the day, when Korea was not that rich, it was an amazing achievement.
I only talk about 2 of 3, since the one not mentioned did not accomplish anything in the overseas.