A birthday cafe is not necessarily a cafe owned by an idol. Fans can hire a space, decorate it with photographs and create a short celebration around a birthday or anniversary. Korea Tourism Organization describes photo zones, fan letters and small collectibles; its Hongdae guide explains that drink orders can come with items such as cup sleeves, photo cards or postcards. What is included depends on the organizer. The interesting cultural move is from watching an artist to making a place together. For a visitor whose relationship with K-pop has mostly been through a screen, a cafe can reveal the design, coordination and social life of fandom. That is our interpretation of the format, not a claim that every fan participates or that attendance is growing this month. Plan around the event, not just the cafe name. Look for the organizer’s current notice, verify the exact dates and address, and check purchase conditions, reservation rules and any stock limits. KTO’s older guide points to announcements on X; a dated social post is useful only if it matches the event you intend to visit. These are temporary, often fan-organized spaces. Decorations and giveaway items from an old guide may not be present on another day. Participation is the point; meeting the artist is not promised. We have not verified a specific October cafe, so none is presented here as bookable now.