When you cannot enter a comma (,) on the "Cheonjiin keyboard"

Sometimes, when using the Cheonjiin keyboard, you may find that you cannot enter text because the comma key is not responding.

On the "Cheonjiin keyboard," you must enter a period before you can enter a comma. The reason you cannot enter a comma is that the period is set to be disabled. You can enter a comma by using the direct comma input button located at the bottom right.