Sometimes, certain things are not as simple and pure as one previously imagined. The fat guy felt a bitterness on his lips as if he had just gulped down a large chunk of poison.
Causality is poisonous.
This is not a metaphor, nor an exaggeration, but a real and tangible feeling.
Had the fat guy not calculated this outcome, perhaps when Mr. Su Bai ended up benefiting, regardless of the choices made, the worst the fat guy could've done was to punch Mr. Su Bai on the chest in envy, before forcing Mr. Su Bai to treat him to a barbecue meal. After the initial jealousy passed, the fat guy would genuinely rejoice for Mr. Su Bai's promotion to Senior Listener.
