MC's job is to be a villainess. First arc MC, ML, FL were celebrities, they were kidnapped and when a gun was shot to ML, FL protected him so when the public knew the story they dragged the MC because she and ML were supposed to be dating and she didn't save him (or something like that) but MC blatantly just told the public that her life was more important than ML and she's afraid of death, and the public hated her even more. In the last part, the MC died because she jumped from a hotel building cuz some creep wanna rape her, ML saw her jump too and when he recalled his memory he thought something along the lines of, "For someone as afraid of death as she was, what did she think when she fell?" That's all I remember.
Might be this one: https://www.novelupdates.com/series/low-iq-supporting-female-waiting-for-death-online/.
Yesss!! That's the one. I was so focused on the villainess part that I didn't think to search for supporting female leads novels. Thank you so much!