Looking for Korean Isekai Manga, BL, reborn into a game

Hi! So guy gets hit by a car, awakes in a body of a 5 year old read headed child. The Route family has 1 mother, 1 father, three older brothers, one red headed and a pair of twins and the MC. Multiple love routes that he is aware of, and is a little concerned over having possible routes with his brothers. Befriend the crown prince and the four prince, blonde and white hair, their uncle is a mage who mentors the MC. Very weak stamina, faints ALL THE TIME!! The ML seems to be the white head prince whose names started with an I. Help a girl put pleaseeeeeeee!!!