bir sırrı paylaşan

listen to the pronunciation of bir sırrı paylaşan
التركية - الإنجليزية
in on
Part of or privy to (something private, especially a plan or plot)

We had to let him in on it after he overheard some of us talking.

having knowledge about or involvement in something

The whole class was in on the plans for the surprise party.

participating in or knowledgeable out; "was in on the scheme"