How to Get on the Main Character’s Flower Path

I was reincarnated in a male-oriented modern fantasy novel that I read as a boredom reliever. I expected a paradise life with the reincarnation privilege. What I was given was the role of a hardcore life as an orphanage’s oldest sister with younger siblings to feed! In the face of a financial crisis, I finally made up my mind. To get on the ‘main character bus’! In other words, becoming a member of the male lead’s harem. Heroine? I’ll do anything. If I can make money by doing it! My goal is to become a common sub-heroine 1 and eat rice cakes, If I earn as much as I can, I will naturally leave later. However… Source: NU