Break up at the Beginning to Help My Brother and His Girlfriend

The mainland's spiritual energy exploded, and everyone in the world was supremely martial. Fortunately, I have precious serum and my future is worry-free. What? My girlfriend I've been dating for many years is actually a supporter! I was completely obedient to you, but you gave my most precious thing to your brother? "You gave my serum to your brother? What should I do?" "I only have this little brother, and I only have one serum, so what's the matter with you?" I can't afford to fill the hole in your family, even if we don't get married! I have the blessing of the system, so you can die guarding your useless brother!