God's Gift [A Yoosung x Saeran/Unknown Fanfic]

*This story contains a few spoilers from Mystic Messenger ! And this relates to BAD END 3 or Yoosung's route! Please look out* "Unknown" has been a name that's been used to describe "him." Is he god? No he's bad. Is he the devil? No he's good. Who is he? Saeran wants to know who he is. After taking Yoosung away from M...