Reincarnation of the Emperor Heaven

What would you do if you were transmigrated Dou Qi Continent, the world of 'Battle Through the Heavens'? What if you become younger brother of the main character of your favourite novel? What if you get only a simple Sign-in system that gives you random rewards? In the story, a college student transmigrated into the world of Dou Qi Continent as the brother of Xiao Yan, Xiao Tian. How is Xiao Tian's journey change the destiny of the great world?... ________________________________________ Disclaimer: I don't own any characters except my OC. -Handsome Mc -Overpowered Mc -Harem -R-18 -English is not my first language. So in the starting chapters, there may be some errors. But I am improving myself. -Pictures are copied from Google. So whoever you are, let me borrow it for reference, Thank you. But if you don't want, just let me know and I will delete it.