Agent Lin Yan was ordered to hunt down his defecting partner "Nightingale", but unexpectedly uncovered the truth about the organization "Hive" using children to develop genetic weapons. Former hunters turned redeemers, the two escaped from Berlin to Iceland together, facing the leader "Viper" and numerous pursuits, fighting for the children's life on the edge of the abyss, and breaking free from the shackles of their own pasts.
