Guiding the Male Lead out of His Trauma

I transmigrated. I became a side character Guide who dies unable to withstand the power of the S-Class Transcendent male lead. The story goes that the male lead, traumatized by my death, overcomes it after meeting the heroine. For his growth and romance, I’m supposed to obediently become a sacrifice, but… “…Do you think I want to just die quietly?” What’s more, my death also becomes the trigger for the villain here to develop a terrible hatred for the male lead. Why? Because I’m his older sister. Damn it. ‘As the head of the family, there’s no way I can die and leave behind my cunning but lovable younger brother.’ So I decided. There’s no reason this story absolutely has to have trauma. So first, I’ve got to survive. I started looking for a way to change my death. “I can keep secrets very well. Why don’t you test how obedient I can be to you, senior?” “It’s because it’s you, senior—not anyone else.” “I don’t need any Guide but you. I want to be loyal only to you, senior.” Just what’s the problem here, in the middle of all this headache. “Cadet Ortis, have you perhaps been hiding your rank?” S-Class. Even my rank has become strange.