Dǎo / yǎn / yòng / huà / wài / yīn / bǔ / chōng / le / zhǔ / rén / gōng / de / nèi / xīn / xiǎng / fǎ

导演用画外音补充了主人公的内心想法。

The director used background narration to add the protagonist's inner thoughts.