後臺老板

Simplified: 后台老板

hòutáilǎobǎn ㄏㄡˋ ㄊㄞˊ ㄌㄠˇ ㄅㄢˇ

    • hidden mastermind
    • person secretly backing someone from behind the scenes

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
the boss backstage
Meaning
The person or group that secretly controls or backs someone from behind the scenes. Usually critical, as in a shady operation's hidden mastermind.

Sources