The phrase zài jiè bù nán comes from a well-known Chinese saying about borrowing and returning, often quoted when someone asks for a favour a second time. As an audio clip it circulates as a short user-uploaded soundboard entry, the kind of sub-second quote creators keep on hand for meme edits rather than a line from a famous show or film. Its appeal is the deadpan confidence: the speaker states the moral as if it were settled wisdom. That is why it keeps appearing in favour-begging skits and lending jokes across short-form video.