A Mission

 "Gilang ... save the cave, Gilang!! The Doppelgangger is looking for a tool to get rid of the cave, Gilang. What's this? I don't want to die yet."

 This teenager's name is Arjuna Raizaski, but more familiarly called 'Joon'. Joon is Uncle Kevin's adopted son.

 There was something too late Jeje realized. He glared at the teenager who looked one grade below him.

 "FUCK! YOUR HEAD, DOPPELGANGGER! WHERE ARE DOPPELGANGERS THAT CAN KILL, HUH? I AM REAL! EVEN YOUR FRIENDS CAN SEE ME, YEET!" Jeje snapped.

 It seemed, the teenager in front of him would indeed be an outlet for his annoyance.

 ( Fyi : Doppelgänger according to Wikipedia is: