Fellow Daoist, Please Stop Pretending!

[Fantasy with a wild premise + comedy + absurd humor + passion + lighthearted] Gu Changsheng transmigrates to a fantasy world. But his System only awakens when he's on the verge of dying of old age. I'm practically dead already, and only now the System shows up? What a rip-off! [Notice, Host: This System can rewrite any backstory for you. If you want, you can even say you're the Creator God!] Hearing this, Gu Changsheng is stunned! A System this incredible actually exists? There's no time to waste. Gu Changsheng immediately rewrites his own backstory into something incredibly impressive. But... Once he's finished rewriting it, he realizes he's been scammed! The impressive backstories rewritten by this rip-off System don't come true right away. Only when Gu Changsheng shows off in public, brags and acts cool, and gets people to believe his boasts are true will the incredible backstories he made up gradually become reality. Bragging? Acting cool? With my wisdom and silver tongue, how hard can that be? And so, from that day on, the Tianyuan Continent gained a “Sage of Showing Off”! Dark upheaval? I suppressed it! Strange invaders? I wiped them out! Ruling across the ages? Heh, now you're talking. I'm wide awake for this one. Stand back! This master is about to show off! For a time, every cultivator on the Tianyuan Continent was utterly shocked! “Damn it! How can this fellow show off so shamelessly?” “Disaster! I can't even out-show-off this guy!” “Fellow Daoist! Please, stop showing off!” The cultivators of Tianyuan gritted their teeth, wishing they could drag Gu Changsheng, this shameless braggart, down on the spot. But gradually, as Gu Changsheng made more and more outrageous claims, people began to realize that every one of his boasts was actually true...