
Not to be dramatic but I'd kill myself if I was MC

Sweetest revenge method: I'd get ml to think that I love him back, play along with his games, and then one time I'd go to the rooftop of the company building in a break period. Don't give any opposite signs, just sweeten him up and kiss him maybe? Then tell him I have a surprise for him and tell him to cover his eyes while I "prepare" it. Let him think of whatever fantasies he likes while I go and stand on the edge of the roof then tell him to open his eyes. Watch the fear flood into his body, then just fall backwards. Don't even jump. Maybe throw him a middle finger as well, why not?
What's the point of living at this point...