Where was Blood Brothers filmed?
2004 film by Wong Ching-po
Blood Brothers (2004) was filmed in Sai Ying Pun Community Complex and Chater Road, 2 places named in its Chinese Wikipedia’s 拍攝場地 section, in China. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Chinese Wikipedia's 拍攝場地 section
Chinese Wikipedia’s 拍攝場地 section names 2 places. Each links to the sentence that says so.

