Thesis (visited their Gangnam store today) can officially leave the Seoul list for pour-over or hand-drip coffee: “we don’t have that anymore”.
Naver maps link: Thesis

Google maps:

If anybody hears an update, maybe they have it again at some point: please leave a comment.

It is still a very nice, spacious store that offers plenty of cold brew and pastries; but I ventured on to get my poured fix…