For Sale is one Suit by Lone Costume of Jun Wook Jun (more recently of JuunJ). Asking $350 shipped to CONUS. OBO. It is a glossy, silver single button, impeccably detailed.
Pick stitched, double vented, and peak lapelled.
Apart from a couple gentle wrinkles, it is in perfect condition. Front pockets are still partially-stitched closed. After a pressing, it should be "as new".
I can't read Korean so I don't know the materials. See photos if you know someone who can...