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What does “khun yai” mean in Thai lakorn dramas?

Thai conversation builds respect through honorifics. คุณ (khun) is the everyday “Mr./Ms.,” but คุณใหญ่ (khun yai) literally adds “big” to make it “the senior khun” or “the head of the household.” Thai lakorns (prime-time dramas) use khun yai to flag the eldest, wealthiest, or most powerful member of a family before any plot detail is given. The title signals authority instantly: every Thai viewer knows the khun yai is the one with the secrets, the inheritance, or the gun.

This clip is a courtroom-and-confrontation scene where the speaker accuses khun yai of murder, presents a button as evidence, and demands a confession. The honorific does the heavy lifting; the rest of the dialogue follows.