I got new pages in Seoul in December. Like others have experienced, there is no raised seal. Unlike other people, there is no mention anywhere on the insert of a seal.
"This supplement forms a part of the passport.
Ce Supplement fait partie integrante du passeport.
Este suplemento forma parte integral del presente pasaporte."
New style pages, with the visa-type sticker on page B. I wonder if Korea had already used up their stock of old pages.