The Terminally Ill Extra is Healthy

Having faced death at the age of thirty, I was reborn as the male lead's childhood friend in a romance fantasy novel. But of all things, I'm an extra who dies young at the age of 18 from a disease. In a novel where the male lead, traumatized by the death of his childhood friend, rejects and pushes away the sickly female lead, only to eventually fall in love and live happily ever after, why did I have to be that 'childhood friend'? It's bad enough that I die young, but I certainly didn't want to inflict trauma on someone else. There's no choice. Now that things have come to this, I have no choice but to make the most of my reborn virtue. Plan A. Don't get close to the male lead. "Prince, ...