Alternate reality
Jin was an alien male who, in the alternate reality, was serving in the command division aboard the USS Enterprise shortly before that starship was destroyed in 2263.
Jin was later held captive in Krall's base. Outside but on the grounds of the facility, he witnessed Manas remove the Abronath from Ensign Syl's head, the bioweapon having been hidden from their captors there.
Freed by Spock and McCoy, Jin was in the last group of Starfleet officers which escaped from the base. They were protected by Captain James T. Kirk using a motorcycle and holographic technology, moments before the group was beamed to safety aboard the USS Franklin. (Star Trek Beyond)
Jin was played by actor Anthony Shim. This character was only named in the source's end credits.
This character's make-up was sculpted by Norman Cabrera and applied by Joel Harlow. (Prosthetics, issue 4, p. 3)