Episode 5 is the one where he shoots the missiles 'till they run out, and he just keeps pushing the button, trying to reassert the meaning of his life. That's how it came across to me anyway.

And Ryu has family? Huh, haven't gotten to that part yet, I look forward to finding out more about them.

And trust me, when I get to an episode that really focuses on Jun as a character, I'll let you know.