one person is pleased

"If you always do what interests you, then at least one person is pleased."

Meaning of interlocutor

Meaning: someone who is involved in a conversation and who is representing someone else:

Usage:
Abraham was able to act as interpreter and interlocutor for our group.

incorrigible meaning

Meaning: One whose behaviour is bad and can not be reformed

Even after punishment you are not changed. You are incorrigible.