I Opened a Historical What-If Timeline in Another World

On the five-hundredth year after becoming a great sage in another world, Yu Xian decided to do something for his homeland, Huaxia.

A year later, the first, and perhaps only, historical what-if establishment in the other world officially opened its doors.

What if Liu Ju became Fusu? Could he lead an army of three hundred thousand to conquer the Central Plains?

What if Han Xin chose to stand on his own? Could the Chu-Han conflict have turned into a Three Kingdoms era?

If Huo Qubing had lived a long life, how large could the Western Han territory have become?

If Zhuge Liang had succeeded in extending his life, perhaps the three kingdoms would never have reunited under Jin?

If Li Longji had died young, would the An Lushan Rebellion still have broken out?

If Liu Shan had transmigrated into Zhao Gou, would Yue Fei's Northern Expedition have succeeded?

If Zhu Yunwen had chosen to dismantle the vassal states gradually, perhaps the Ming dynasty's vassal problem could have been resolved over time.

If Wan Zhen'er had had a son, neither the Jiajing Emperor nor the Great Rites Controversy would have existed.

And if…

The historical curiosities caused by these events are another story entirely.

Note:

1. The male lead intervenes in history only to remedy some of its regrets or explore other possible courses of historical development.

2. The male lead Yu Xian's name is both "Xian Yu" (literally, "salty fish") backward and a play on the mnemonic "Odd stays, even changes; the sign depends on the quadrant." (This is a mnemonic for finding the sine and cosine, and tangent and cotangent, of trigonometric functions.)

3. The history created by the what-if timelines exists in parallel worlds and will not affect actual history.

4. The what-if timelines currently planned include Qin (Liu Ju transmigrates into Fusu), Han (Han Xin is not executed, and Huo Qubing lives a long life), Three Kingdoms (Zhuge Liang succeeds in extending his life), Tang (Li Longji dies young), Song (Liu Shan transmigrates into Zhao Gou), and Ming (Zhu Yunwen does not aggressively dismantle the vassal states, and Wan Zhen'er has a son), among others.

Theme: Remedying the regrets of history