There is a knife on the willow tree and blood on the mulberry tree(liǔ shù shàng zháo dāo，sāng shù shàng chū)

There is a knife on the willow tree and blood on the mulberry tree

Idioms are used to refer to the past.

Chinese PinYin : liǔ shù shàng zháo dāo，sāng shù shàng chū