Flowerfell belongs to underfell's colleague, and tells the story that every time frisk died, every time he moved to the open sea to grow abalone, a golden flower would grow from the wound. Sans once hurt frisk and began to protect frisk after learning the truth, but frisk died after being covered with golden flowers. .........
The story of flowerfell is basically the same as that of normal underfell, except that in the middle period, sans will be attacked by you (in various senses) and become your guardian. Every time frisk is reset (save/load/reset), a small flower will grow on her body. As for the ending/video/av5881511/
Underfell is similar to the original, but the characters are different and become extremely cruel. On the contrary, the characters and plot lines are still the same.
Flowerfall can protect you by raiding fellsans, because monsters are cruel and want to kill humans. When human beings die, they will grow a flower. After the raid is successful, Fairsands will stay with the human beings until the end. "Falling Flowers" is simply a love story of human and fellsans abusing their hearts.
To put it simply, one dies without flowers, and the other dies with flowers!