A dash reads as "left open" where a solid edge reads as "filled in." Coverage of Korean venue data is partial and always will be — no API supplies hours, closures or 정기휴무일 for ordinary venues — so unknown is not an edge case to bolt on at the end. It is what most externally-sourced fields say, and it has to look deliberate rather than broken. 🚨 Never red, in any of the three. A red unknown reads as you did something wrong when the thing missing is ours. §2.3.