The System Wants Me to Use Buffs, but I Become Invincible Instead

[No transmigration, System-based, male lead starts out invincible!] After waking up one morning, Chen Shijie, who has a terminal illness, acquires an Infinite Buff System. Every day, he’s either grinding buffs or on his way to grind more. Only seven days left to live? No need to panic. I’ll get a Longevity Buff first: every day that passes adds a year to my lifespan! Broke? With the Tycoon Buff, why not make money while lying around? Not handsome enough? I’ve got a Beauty Buff built in. I’m the center of attention the moment I show up! What? They’re ganging up on me? I’ll activate my Berserk Golden Body Buff. I don’t even need to dodge. I can stand right here and still turn the tables! Don’t mess with me. I’ve got, like, a billion buffs. I’m super dangerous!!!