Jung Woo goes to Gyeongju tower and stops Son Hyuk's henchmen from launching the missile.
In a last ditch effort to make up for multiple failures, Son Hyuk breaks into NTS headquarters. He intends to plant a bomb and kill everyone.
Son Hyuk has Jung Woo at gun point when Hye In shows up and shoots him. Hye In attempts to shoot herself in the head but Son Hyuk reaches for her gun at the last second to redirect the shot. She is wounded but survives. Son Hyuk dies.
After she recovers, Hye In heads to New Zealand. Jung Woo quits NTS and follows her there a year later. The end.
DramaFever has 21 episodes on their site but 21 is a behind the scenes special of the drama. It's not an actual episode.
I hope you enjoyed watching Athena: Goddess of War. Iris starts next Monday, May 23.