From the Start, I Bet Five Years of My Life, Then the System Explodes and I Can Kill at Will

[System + lifespan-fueled power-ups + invincibility + concept enhancement + ruthless decisiveness + extremely cautious + A Dream of Jianghu + fused protagonists from numerous novels!]

The Heavenly Dao dragged Liu Yaochen into a world where many worlds had merged and an eerie calamity was about to descend. The task of saving the world fell to him!

Luckily, he unexpectedly awakened the strongest lifespan-fueled System. The catch? He had only five years left to live from the start!

Just as Liu Yaochen prepared to go all in and start using the System, it suddenly bugged out!

“Whoa! Buying stuff doesn't cost lifespan? I'm going to be unstoppable!”

And so, his plan to save the world began!

But to Liu Yaochen's surprise, why were there protagonists from other novels in this world too?!