guyu (onde): fig
While a fig might appear ripe and juicy from the outside, the inside is full of ants.
The fig fruit ripens from pale green to yellow or red, and is fleshy and sweet. When it becomes very ripe, it develops an opening at the bottom (flower end). Ants like to go in and eat the sweet meat of the fig.
The attractive external appearance of something is not a reliable indication of its true nature. A good looking person might have an unattractive character or personality.