Du Huashen

Jia Pangzi is the first born son of the Eastern Supreme and is engaged to the princess of the Shensheng Diguo. Unfortunately, he was swapped at birth and replaced by the imposter—Yang Cheng—who wishes for nothing more than the destruction of the "surface" which he hates so much.

Yang Cheng is the first direct disciple of the plague demon cult's great venerable Hao, and an expert in poisoning. He grew up alongside his mother, whom he killed, and was taken in by his master, who see sees as high and mighty as God himself.

But after a few years as Jia Pangzi, Yang Cheng "forgot" his purpose and was retrieved on the orders of his master to come back to his true home—the plague demon sect.

After Yang Cheng's arrival at his forgotten home, he re-entered the plague demon sect and got admitted as an inner disciple, where he was reunited with his master. The only problem being his forgotten his memories.

With his master's mysterious techniques, he remembered himself as Yang Cheng, and vowed to destroy the surface and bring down everything else there.

Meanwhile, on the surface, unknown tensions broke out due to his tensions. After his sudden return, many began to question his origin, but were shut up by supreme commander.

Unfortunately, force could only govern outside words and actions—not thoughts.

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This is a summary of the 45k word and three part backstory and summary of Jia Pangzi with some extra details. The full version is found in the auxiliary chapters.
(the numbers are somewhat important)
1. Yi 2. Er 3. San 4. Si 5. Wu 6. Liu 7. Qi 8. Ba 9. Jiu 10. Shi
1. 一 2. 二 3. 三 4. 四 5. 五 6. 六 7. 七 8. 八 9. 九 10. 十