What were the extras in the Douluo Continent manga? Also, in the past month, it was MK240.239.238 or something. Why wasn't there a Douluo…

What are the extras in the Douluo Continent manga? In the last month, it was MK240239238 and so on. Why is there no Douluo? At present, the Douluo Continent manga had already released many separate volumes. The specific content of the additional chapters varied according to the different versions. The following are some possible exceptions: "Douluo Continent"'s "Heaven Dou Empire" tells the story of Tang Wulin and the soul masters 'history of the Heaven Dou Empire, including the empire's rise, wars, and revolutions. 2 "Douluo Continent"'s "Legend of Spirit Masters": It narrates the techniques and stories of Spirit Masters in cultivation and battle, including the path of Spirit Masters 'cultivation, spirit beasts, spirit rings, etc. 3."Legend of the Dragon King" from "Douluo Continent": It narrates the story of Tang Wulin and the legend of the Dragon King, including the appearance of the Dragon King, the battle, and Tang Wulin's growth. 4. Soul Device in Douluo Continent: It talked about the design and usage of soul devices, as well as the challenges and opportunities that soul masters faced when using soul devices. As for whether there are any Douluo Continent side stories in the past month, I am unable to provide the latest information as the deadline for my knowledge is 2021. However, in general, the additional chapters of the manga would usually be released a few months or a year after the publication of the manga. The specific time depended on the arrangements of the publishing company and the cartoonists.