Journey to the West

Journey to the West - Liaozhai

The protagonist's surname seems to be Lu, and the system is a very old one. The protagonist is following the path of the Heavenly Immortal Way, which is the foundation of Tianmen. There are five ways of cultivating immortals in heaven, earth, humans, gods and ghosts. I can't remember the content roughly. Anyway, I only know that he and Sun Wukong are brothers.