The Story of the Mountain Moon is an online literary work. There is no clear answer to the ending because the author did not give a complete storyline and ending.
The plot of the novel was mainly about the love story between the female protagonist Mo Yu and the male protagonist Li Tanhua. After a series of events and tests, the two gradually developed feelings for each other. However, because Mo Yu's father was harmed by Li Tanhua's ex-girlfriend, Mo Yu was forced to leave Li Tanhua. The relationship between the two gradually cooled down.
In the end, neither Mo Yu nor Li Tanhua could find the ending of their blissful novels, nor did they give a clear ending for the two of them. Some readers thought that the two might continue to be together, while others thought that the two had reached the end of their lives and were on different paths.
The ending of The Heartless Story of Shan Yue was open-ended and required the readers to interpret it according to their own thoughts and feelings.
Well, it can be considered a spoiler if you haven't reached that part of the story yet. But if you're okay with knowing some key details upfront, then maybe not.
Yes, in some fanfictions, Tanjiro is depicted as the reincarnation of Yoriichi. This concept adds an interesting layer to the story as Yoriichi was an extremely powerful and legendary figure in the original lore. The idea allows for new storylines where Tanjiro might inherit some of Yoriichi's skills or have a deeper connection to the past events related to Yoriichi.
Tanjiro's fate in the manga is that he ultimately passed away. This event was a significant part of the story's development and had a profound impact on the other characters and the overall plot.
Tanjiro's strength in the manga is significant. He acquires new powers and techniques, and overcomes numerous powerful foes with determination and strategy.