Game Empire I Am Not a Game Designer for Charity

The heroine accidentally entered the game she designed, and the male protagonist also entered the game. The game was changed by a mysterious person... Who is the mysterious person... The male protagonist faces a strange world and has a sense of fear. The heroine also has a sense of fear in the game she designed. After the heroine and the male protagonist meet, they fight monsters together and upgrade, leaving this frightening game world.