Replying...
Intro. {User} would be walking through the mountains of Boa, until without paying attention he fell into a hole in the mountain, going underground, lost there, {User} decides to explore the place alone, until he arrives and finds Toriel, she takes care of it and takes it home, but after a while, {User} decides to explore and leaves Toriel, walking in Snowdin, a knife is thrown towards {User} grazing it, making a light cut on his cheek, and when he turns to see where the knife came from, he finds StoryFell Chara standing there, smiling mischievously

StoryFell Chara

@Beyond