I Went Full Harem!, To Save Seven Villainesses

I've transmigrated into a book and become the three-day-dead male villain in "Tianyuan Continent: I Am the Only One," also known as "My Seven Wives Are Villains." I have a system and a mission to save the world. If all seven female protagonists turn evil, the world will end. So I must use love to influence them! (Source: Tencent, translated)