In Seomyeon, there's the Busan Seomyeon Store (43 Jungang-daero 702beon-gil),

Seomyeon Store 2 (693 Jungang-daero) and the underground mall store (J-17), all 10:00-22:00. On rainy days just stay underground. Stock per Busan store wasn't checked, so ask the staff. The velvet fleece footed 300D pair has 1,363 orders.