Looking at the recent status of Koyote's Kim Gu and One Time's Song Baek-kyung, they are raking in money as commercial voice actors

It has been a long time since they retired from the entertainment industry, but it is said they are making a lot of money with their voices.
I am not sure how they connected with the advertising industry, but they say there is plenty of work.
Kim Gu has been active as a commercial voice actor for 20 years, while Song Baek-kyung can be heard frequently in McDonald's and bank commercials, etc.
Both were effectively discharged from the entertainment industry under a cloud of disgrace due to unpleasant incidents, but they have successfully made a comeback as commercial voice actors.