https://simg.donga.com/ugc/MLBPARK/Board/16/67/79/39/16677939323590.png
(images from that site is hard to import. Attendee figures in thousands - 000s cut)
Singers who also did a concert in Seoul's Olympic Stadium or Sang'am Soccer Stadium are in bold. You probably guessed what I will write in the end, but I will go on.
30. EXO - CBX (Chen , Baekhyun , Xiumin) - 146 - 13 concerts
28. Taeyang - 170 - 17
27. NCT127 - 172 - 31
26. Super Junior KRY - 209 - 26
25. Infinite - 223 - 25
24. Blackpink - 314 - 12
23. SJ Donehae & Eunhyuk - 354 - 53
21. Taemin of Shinee - 443 - 57
19. JYJ - 450 - 9 (it is not a typo.)
18. BoA - 534 - 107
17 - Junsu of JYJ - 549-46
16 - FT Island - 561 - 73
15 - Jaejoong of JYJ - 563 - 59
14 - Twice - 578 - 37
13 - Daesung - 580 - 91
12 - GDragon - 611 - 13
11 - CNBlue - 727 -78
10 - Seventeen - 767 -53
9 - SNSD - 825 - 60
8 - IKON - 1282 - 126
6 - EXO - 1323 - 68
5 - 2PM - 1461 - 104
4 - BTS- 1568 - 73 (BTS is underlined because it had a main concert in Seoul's biggest venue which was full and was for 2 days. You probably guessed why I am adding all these words, but this post is not over yet.)
3 - Shinee - 2300 - 150
2 - Big Bang - 5893 - 177
1 - DBSK (counting both the 5 member and 2 member days) - 6063 - 232
All these acts did great in Japan, where the most money for KPop is.
But the Koreans did not get the lesson and ignored the achievements of these acts in Japan.
Honorable mention
Not ranked - IU - 0.000 - 0.