After the fall of Overwatch, Dr. Angela 'Mercy' Ziegler was haunted by guilt on what she did to an old friend and she knew he wouldn't forgive her, for her actions were irreversible.Years passed until Winston had recalled the former Overwatch members to fight back Talon, who has wreak havoc the whole world.What will she do when she face back her nightmare in the past? MercyKill fanfic.Just doing for ship craving's sake. I do not own Overwatch.