nàge dǎoyǎn zài zìjǐ de diànyǐng lǐ kèchuàn le yī ge juésè.
The director made a cameo appearance in his own movie.
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Originally from Chinese opera: 客 (guest) performers would 串 (string together/join in) a performance they weren't part of the regular cast for. Now widely used in film and TV.
