Journey to the West: It All Starts with Feeding the Oxen

Li Xuan: “Ha ha! I made it, Daoist Master!” Heavenly Soldier: “Li Xuan, this is where you'll be working from now on.” Li Xuan: “Yikes, tending cows? I'd rather guard the gate... Wait, the workplace is Doushuai Palace? Ahem, I'll report for duty right away.”

He later becomes one of the trials that obstruct the Journey to the West, and awakens a System. As long as he can extend the time it takes to complete the journey, he earns generous rewards. At first, Li Xuan doesn't think much of the rewards.

But years later,

Li Xuan looks at the Exquisite Pagoda, the Taiji Diagram, the Pangu Banner,

the Three Treasures Ruyi, and the Four Swords of Zhu Xian in his hands...

Only then does he realize that his System was given to him by those three great powers.