Son Hyuk's superior within Athena shows up to take over the operation. He imprisons Son Hyuk and attempts to capture Hye In. Andy/Randy helps her get away and Son Hyuk break free. Son Hyuk kills his superior and takes back command.
Although there's circumstantial evidence that Son Hyuk might attack multiple targets, NTS believes he's really after the nuclear plant in Gyeongju. They head there after him.