No backdrop availableOnce Upon a Time in HKDSE公開試當真2024DocumentaryJuly 4, 2024 · Hong KongSave to watchlistMark as seenShareDetailsStatusPost-productionRelease dateJuly 4, 2024Original languageChineseSpoken languagesCantoneseCountriesHong KongProductionTrial and ErrorBudgetNot recordedRevenueNot recorded