I'm a Passerby, You Want Me to Save the World?

Lu Ren, a name that sounds very familiar to everyone. Travel to the fantasy world and obtain the strongest passerby king system. Lu Ren: Even if I am just a passerby, I will be the strongest passerby king. Then, his experience began. When the Son of Destiny was dueling with the villain, he was there! Exploring the ancient secret realm, he is also there! When the ultimate villain decided to destroy everything, he was still there! In this way, the years pass, the sun and the moon change, and endless eras pass. He also went from an unknown passerby to a slightly famous backdrop. Wherever the story happens, Lu Ren is there! …… In the final decisive battle between the ancient immortal emperor and the world-killing demon, the ancient immortal emperor finally failed. Just when the world-killing demon was about to plunge the world into ultimate darkness, countless creatures in the world began to shout that name... "I beg Lu Renzhi to take action to suppress the darkness..." Lu Ren, who was hiding in the long river of time and watching the show, was confused. I'm just a passerby, you want me to save the world?