为所欲为 Origin — Chinese Character Wiki

wéisuǒyùwéi

to do as one pleases

为為 wéi verb

to do

to do; to make; to act; to govern; to manage
所 suǒ particle

[relative]

Used before a verb to form a noun-like phrase representing the object of the action, meaning "that which" or "what".
欲 yù verb

to want

(bound form) to want; to wish; to desire
为為 wéi verb

to do

to do; to make; to act; to govern; to manage