Oto Gimbap, Sangsu main branch

A tart shop in the Yeonnam alleys. It takes no bookings — you put yourself on the list using a tablet at the entrance. The tablet offers Korean, English, Japanese and Chinese, but the call goes out over KakaoTalk, so without a Korean number you wait in front of the shop rather than walking off. It opens at 13:00 and closes Mondays, which rules out a morning stop.

A live music hall in the basement of a building on Eoulmadang-ro, Seogyo-dong. Seoul's cultural-venue listing gives it 200 seats or 450 standing and dates it to 1995. The line-up changes nightly and each show is sold through whichever ticketing site that promoter uses. The one the venue's own site links to, Melon Ticket, requires identity verification through a Korean domestic mobile number before it will let you buy, so that route is closed to a visitor without a Korean number.

A cultural complex opened by the tobacco company KT&G in September 2007. One building, seven storeys up and four down, holds a gallery (4–5F), a design square (1–2F), a live hall (B2) and a cinema (B4). Walking into the building itself costs no ticket, but the live hall and the cinema each sell through a different channel, and the official site is in Korean only. Each floor runs its own calendar, so decide which one you are going for and check that floor's schedule before you travel.

A branch of a gimbap-and-udon snack chain on the ground floor of 114 Yanghwa-ro, open 24 hours per its DiningCode listing. It is the Hongdae option for breakfast at any hour on any day. Basic gimbap is ₩4,000 and udon starts around ₩6,500. The listing tags it "open all year".