【入幕之宾】〖rù mù zh bn〗[serve as adviser to sb; a frequent and welcomed guest; a constant friend]

入乡问俗用心机，

幕后操纵蚁蝇集。

之叹北门被诬陷，

宾伏苟利议谋私。

比喻关系亲近的人或参与机密的人。Metaphor relationship close of people or participate in confidential of people.