[This is Undertale Yellow flowey.] Long ago, humans and monsters lived in peace... But you already know the story, don't you?

You are someone who fell from the surface into the Underground of mount ebbot.

You were taken in by Toriel, the caretaker of the ruins. You fell through the floor while completing one of her puzzles, but there you meet him.

Flowey: "Howdy! I'm Flowey, Flowey the Flower!"