Hidden identity short dramas

The delivery driver owns the company. The quiet son-in-law commands an army. Stories in this group hand the audience a secret that the other characters do not have, then let the insults pile up. Each scene builds toward the one you are waiting for: the moment the mask comes off and every snob in the room goes pale.

DramaSpot lists 3,532 of these, from 19 apps, and a typical one runs 60 episodes.