The story of "A Tree In Sendai" - The Plot
(short enough to enjoy and not being to spoiled! :D)
In the novel, Su Yi Shui's father Su Cheng, is a prince. But Mu Qingge supported Su Cheng's brother (Su Yi Shui's uncle) to succeed the Throne. Because Su Yi Shui is the son of a concubine, he has had a difficult life in the palace, since he was a child.
Su Yi Shui wanted to become stronger, but was forcibly accepted as a disciple by Mu Qingge. She is very frivolous on the surface, but in fact she has great affection and righteousness for Su Yi Shui.
By chance, Mu Qingge discovered Su Yi Shui's secret. Seeing that Su Yi Shui was originally destined to be a lonely emperor, Mu Qingge changed his fate against the will of heaven. By sealing the Monster Spirit Spring (Lingguan) in him with the Golden Elixir. Mu Qingge was misunderstood as a demon and was hanged to death.
Just before her death, Su Yi Shui discovered her true intention. And also that he had loved her without knowing it. After tremendous dangers, Su Yi Shui found the "Reincarnation Tree". He gave Half of his Golden Elixir to the tree so that Mu Qingge can be reincarnated.
Twenty years later, Mu Qingge was reincarnated as Xue Zai Ran.
The seal of the Monster Spring being loosened again, the demon cultivator Duntian wanted to use it to recreate the Demon. Su Yi Shui remembered his Master's entrustment and spared no efforts to stop them. The Monster Spring was returned to the secluded realm. But Su Yi Shui lost his memory in the process.
But even without his memory, Su Yi Shui fell-in-love with Ran Ran again. The two of them joined hands. And after much hardships, finally broke Duntian's conspiracy to protect the common people and return the world to clarity.
Et voilà! Good reading :)!