Hey for once I came up with a normal title

Anyways, in this AU, every time you fall in love, a tally mark will appear on your wrist. If it's red, your love is unrequited. If it's black, they return your feelings. But if the person you love dies, the tally mark will become a scar

This could go in multiple directions. Someone who's terrified of falling in love suddenly gets a tally mark, someone who is aromantic sits back and laughs at the system, but also helps others with their love lives, literally anything. Just give me a plot to work with.