It's still hot during the day, so is there a linen-blend jacket that's good to wear neatly for work?

Based on your criteria, I picked transitional jackets blended with linen. They range from work jackets and trucker styles made of a cotton-linen blend that give a neat silhouette, to camel-beige tones blended with virgin wool, and a one-button style blended with rayon. All are in the mid-to-high KRW 100,000s price range.

I picked wool-blend tailored jackets made of wool mixed with polyester, rayon, and other materials. They range from a neat semi-oversized single-breasted line to a structured double-breasted style and a charcoal-toned one-button design. Classic tailored jackets made of 100% wool were excluded from the options to match your blend requirement.

I picked tailored jackets whose outer material is made of 100% wool again. They range from standard classic silhouettes with peaked lapels and shoulder pads, to an oversized fit where you can transform the neckline with a button under the collar, and a single-breasted suit jacket with a sturdy herringbone weave. Blended items mixed with polyester or rayon were excluded.