You might try some popular streaming platforms like Netflix or Amazon Prime Video. They sometimes have foreign language films available with VOSTFR subtitles.
There could be Soldier: 76. Since they are all part of the Overwatch team, he might be involved in the story in relation to Mercy. Maybe she has to heal him during a battle.
Yes, 'Mercy Black' is based on a true story. It often takes real - life events and weaves them into a horror narrative to create a more chilling and believable experience for the audience.
I'm not sure specifically what 'mercy novel' is about as it could be a very specific or self - named novel. It might be a story that focuses on themes of mercy, perhaps about characters showing mercy in difficult situations or a world where mercy is scarce.