I Eat Royal Food in the Immortal Dynasty

Chen Jiang was reborn in a world where cultivating immortals was the most important thing, but the outrageous thing was: if you want to become immortals, you must first take the exam! And this exam is ridiculously difficult, and the only way to "save the country" is to be obedient and undercover. From this moment on, cultivating immortality not only relies on fighting and killing, but also relies on being sober and adaptable. The story is a bit long and I don't have thousands of words to explain it clearly, so please move on to the main text! (Don't support books, please support me and continue to read, otherwise I will be supported to death)