Is there any data on this from South Korea? Supposedly they forcefully tested 200,000 members of Shincheonji because that's where the initial cluster started. There is nowhere near 200,000 infections in Korea, so obviously a vast majority of these people tested negative. But I'm sure some tested positive. And since they were mandatorily tested, I'm going to guess some were asymptomatic. If these events happened the way I think they did, this seems like a huge source of data on % asymptomatic.

Otherwise, for as much testing as Korea is doing, I'm sure many are doing it because they have a reason. So they were exposed, or are actually exhibiting SOME symptoms.

But if it's true that 200,000 people were tested just as a precaution, seems like there would be some people there that tested positive but were asymptomatic and never would have even thought to take a test otherwise.