Preface:
Eugene or Euge does not remember anything from his past.
All he knows is just when he woke up he is in a huge and scary place for a 5-year-old kid like him.
(However, of course he does not know what a hospital meant to be for a kid like him.)
He does not know where he was or how or why he even been there in the first place and who knows who is he or where he come from or how did he end up there.