I never told you guys, but Jack is Ren's "senpai" in the Police.
Both of them have a strong sense of justice, despite being a little different from one another.

Ren is usually the quiet type and usually says the necessary, always looking forward.
Jack is the kind of "big brother" type that is always got your back.

They are a pretty great team, and is really great draw them together for the first time.