Storms in the Late Sui Dynasty

Intern at Ye Jindong Medical University. Coming home from get off work that evening, I walked through an intersection and accidentally fell into a sewer pit. When he fell, he cursed: "Damn it! You are so unethical and stole the manhole cover again, ah..." Since then, he traveled across time and space to the end of the Sui Dynasty, and accidentally saved Yang Guang... However, it seems that all this is not that simple. Is it accidental? Or is there another secret? … Let's look at the storms at the end of the Sui Dynasty, how Ye Jindong mixed up in the Sui and Tang Dynasties, and how he unraveled the causes and consequences...