Q. What happens to the living unsaved after the GWT judgment?
A. The Great White Throne judgment will take place at the end of the Millennium (Rev. 20:7) The purpose of its description in Rev. 20:11-15 is to inform us of the final disposition of the unsaved dead from all time. Therefore there is no mention of any living unsaved in these verses.
But it appears that the Great White Throne judgment will be the last one before eternity begins, and it seems likely that there will be both believers and unbelievers from the Millennium who aren’t mentioned in the Bible. Some of both groups will have died while others will remain alive. I think all of them will be covered by Rev. 20:15; “If anyone’s name was not found written in the book of life, he was thrown into the lake of fire.”
The names of living and dead Millennial believers will be in the book of life, and they’ll be welcomed into eternity. Both living and dead unbelievers will be thrown into the lake of fire. I say this because no unbelievers can remain alive once eternity begins.