Jin Yi

The plot's core: flings the tea to the floor at the feigned flattery, then supplies the plan (kill Wang Bi, use his troops, enthrone the Emperor at the Tower of the Five Phoenixes, summon Liu Bei) and the Ji brothers. His own fire signal starts the night — and his wife's question through the door ('have you killed Wang Bi?') hands the fleeing target the whole conspiracy. Slain in the fighting.