Welcome to Halo Answers. What would you like to know?

There is no extended story of Jun that anybody knows of except for Frankie.

who is frankie

Frank O Connor, the person who controls 343i and has the Halo Bible.

It isn't canon, but you could check out A Fistful of Arrows by the Leviathan. Its fan fiction, but its amazingly written and really should be added to the canon.

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