One is an actor and the other is a singer, there is no comparison.
But in terms of the number of fans and national fame, Quan Zhilong is more popular.
Bigbang, to which he belongs, is the most popular boy group in South Korea. He is also the leader and the composer of most of the songs. Hot songs such as "Day by Day" and "Blue" are all written by him. She is also famous as a trendsetter because of her fashionable clothing. He is the most influential idol in the Korean entertainment industry.
Song Joong Ki became famous this year because of Descendants of the Sun. After the series is aired, his popularity will slowly decline (see Professor Do).
In the past, Nandu posted two photos of Lu Han and Song Joong Ki. When asked who was handsome, the answer was always Lu Han. If the photos were taken of Lu Han and Quan Zhilong, I really can’t tell who has more fans.
So, G-Dragon, who has been at the top of the Korean music scene since 2007 and has never declined, is even more popular.