at the mercy of
Chinese idiom, Pinyin is f ǔ y ǎ ngsu í R é n, which means every move is at the mercy of others. It comes from sending Li Gongshu to the palace.
The origin of Idioms
Song Sushi's poem "sending Li Gongshu to the palace" said: "an Neng is always in the dust, and he looks up to others like an orange."
Idiom usage
It means that everything is controlled by others. example Zongheng has its own cloud pen, but it is pitiful to follow others. The second one of Jin · Yuan Haowen's poems on Poetry
at the mercy of
engage in malpractices for selfish ends - yíng sī wǔ bì
change existing habits and customs - yí fēng yì shàng