20 Space: The Mint Universe (Cube Cafe)

20 Space: The Mint Universe (Cube Cafe) is a café nestled in Seongdong-gu, right beside the Cube Entertainment building — an obvious pull for K-pop fans and curious visitors alike. The interior creates a relaxed vibe where you can sip coffee or cool down with specialty drinks like the BtoB Slushie or 아아 펜타곤 버블티, both nods to the artists under Cube’s umbrella. Expect the menu to lean towards sweet, artist-themed beverages, some on the pricier side, with occasional sold-out items reflecting their limited availability and demand.

The space attracts a diverse crowd: local fans eager for a chance encounter with idols, young groups hanging out while watching music videos on screens, and freelancers or students using the communal tables for work or study. One distinct feature is the presence of branded merchandise, offering a tangible way to connect with Cube’s artists beyond the music.

Adding to the interactive atmosphere are playful touches like a photo booth for capturing memories and a sticky note board where patrons leave messages—little community markers amid the café's buzz. The café feels most lively during afternoons and early evenings, when fans gather after visiting nearby entertainment offices or exploring the neighborhood.

Those who come for more than just coffee often find the desserts, especially the tiramisu cake, satisfying companions to the drinks. While sweetness is a recurring theme, regulars appreciate the chance to soak in the music-themed environment or to quietly work with a view of Cube’s world just outside the window. It’s a spot that feels both a fan-hub and a chill place to pause, especially for those familiar with Korean pop culture or seeking a thematic café experience in Seoul’s artistic Seongdong district.