Not an Ordinary Person? Elder Brother! How Did You Become an Immortal!

My name is Ye Tian, ​​and I have terminal liver cancer. But I'm still young and have a young sister to take care of. I don't want to die like this. Since modern medicine can't save me, then I will abandon the materialistic worldview and find a way to become an immortal! ... My name is Ye Xuanyue. I have a brother who loves me very much, but he disappeared some time ago. Through the diary he left behind, I know that my brother is looking for a way to become an immortal, but how can an immortal exist in the world? My brother must be crazy! No, I must find him as soon as possible and pull him out of his madness! In order to find traces of my brother, I followed the diary written by him and came to various places he had explored before. But after experiencing one thing after another. The Five Immortals: Liu Xian, Peach Blossom Spring Village, Xiangxi Zombie Groom... It turns out that I am the ignorant person! There really are immortals in this world! There really is a way to become an immortal!