Survive as the Villain's Cousin

The culprit who briefly appeared in the novel's side story and turned the twins, her cousins, into villains!\r\n\r\n...Who would have known I would be reincarnated as that person? I sighed deeply and made a vow.\r\n\r\n"Let's raise the twins with love and make sure they don't turn into villains!"\r\n\r\nIgnoring the novel, I decided to get along with the twins, but the secondary male lead, who I thought would have no involvement, started getting obsessed over me!\r\n\r\nAh, where did things go wrong?\r\nMoreover, I was only trying to prevent the twins from turning into villains, so why did the secondary male lead end up a villain instead?\r\n\r\n"Please, please don't spiral away any further. I don't know how much longer I can endure this."