G-Dragon & IU - Copyright wealthy

allkpop: BIGBANG's G-Dragon and IU are the only idols ranked as the wealthiest celebrities from copyright royalties in South Korea.

https://www.allkpop.com/article/2022/03/bigbangs-g-dragon-and-iu-are-the-only-idols-ranked-as-the-wealthiest-celebrities-from-copyright-royalties-in-south-korea

Of course many idols do try their hand at song writing. But few write songs that are so popular to list among the wealthy by copyrights.

Quote from tetetete

First place was Bang Si-hyuk. Bang Si-hyuk was ranked No. 1 in the list of songs with a total of 740 songs.

He ought to be, given BTSs success.

And Pdogg has been winning the KOMCA Daesang for few years producing most of BTS songs.

But they aren't performing idols.