Tracked on 1 list across 1 authority.
First Mondrian hotel in Asia in Yongsan, modernist high-tech design with indoor/outdoor pools, spa, sauna, and restaurants including Cleo.
Description via RUSSH.
Mondrian Seoul Itaewon appears on 1 of the lists Mouga tracks, and written up on 1 more. Here's the full trail, dated and linked to each source.