My Lady Protagonist, Please Protect This Supporting Character

An imprecise blurb: She was actually dragged by a transmigration System into a parallel world from a novel, then possessed a character from that novel? Apparently, the original owner was an utterly hopeless supporting female character? Other people who transmigrate get a System, and so does she, except... It gives her no benefits and still forcibly demands that she complete missions? And the mission the System forces her to carry out is even more outrageous: kill the male lead?? O_o But apparently fate thought that wasn't enough torment, because she keeps running into piles of melodramatic plot twists and bizarre people, and somehow she can't avoid any of them? If she can make it through alive, she'll deeply understand just how brilliant it was to cling to the female lead from the start o(╯□╰)o The couples are Lou Xiaoxiao and Song Anya. Yuri, with a guaranteed happy ending! [A potful of brain-fried, foolish humans] [The female lead is not right in the head] [Turns out, female leads and female supporting characters are meant to love and fight each other] Theme: