Immortality, Start with an Innate Cave

Wang Wudao traveled through time and became immortal at the beginning, and the system rewarded him with an innate cave. So Wang Wudao decided to stay in the cave and not go out. Since he was already immortal, why would he go out to fight and kill people and seize immortality? One day, a green snake broke into the Xiantian Cave and worshiped Wang Wudao as its teacher. Thousands of years later, a demonic snake named himself "Green Emperor" caused havoc in the Heavenly Palace. Another day, a monkey worshiped Wang Wudao as his teacher... "Wait a minute, accept me as your master. After you come down from the mountain, you must not mention my name, otherwise I will eat monkey brains now." "I, Old Sun, will definitely keep my mouth shut and will not mention my master's name."