ZeZone's manga / #Hero(3)

this was my sisters favorite story. she really likes it so i need to bookmark it if i wanna remember

Hero x Demon. eloped lovers. no marriage but husband and wwife. cute. hardcore.

about a shapeshifter who got hired by num1 hero to pose as him for a day but suddenly he has to pose as him until he solves a murder case. slowwly mc gains the number 1 hero and in the end becomes a hero himself.