Manga My Oppa is Too Innocent

After dying from overworking at an evil, exploitative company… “Your highness! There’s a mountain of paperwork to do…!” I’ve transmigrated as the little sister of the aide that’s being overworked by the crown prince!! How dare he exploit my oppa’s ‘kind and innocent personality’ to boss him around. I can’t let my oppa face the same fate as me in my previous life!!! That was how my plan to split the two men apart started, but… “Hmm. Why don’t you join us on this occasion…