In Seongsu, Olive Young N Seongsu (13 Yeonmujang 7-gil) is open 10am–10pm, and

Seongsu Station (91 Achasan-ro) 10am–10:30pm. Beyond the collab, the Classic Tongue Cleaner has 4,904 reviews at 4.7. Both stores are a short walk from Seongsu Station.