He and his wife Marcy had a son named Kyle. The boy was unable to escape in time when the mercenaries attacked Quincy, resulting in his unfortunate death and leaving Jun deeply depressed. Jun is currently recovering from the loss of his son. He has high hopes that the Sole Survivor will find their own son, Shaun.
Although initially depressed, as the settlement is upgraded and the happiness level increases, he will occasionally be somewhat more optimistic and tell the player "I hope you find your son", but his demeanour is largely unchanged.
Sometimes he can be seen talking with Sturges, who tries to raise his spirits.