冤魂 is a staple of Chinese ghost stories and folklore. Wronged spirits are believed to linger in the world of the living until their injustice is resolved or avenged, a concept that has inspired countless stories, operas, and films.
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冤 means 'injustice' or 'wrongful' and 魂 means 'soul/spirit'. A 冤魂 is literally an 'unjustly treated soul'.
