There Is a Mortal Who Wants to Become an Immortal

As a beggar, I just wanted to earn three copper coins to save my grandfather. However, the world was unfair, bullies forced my relatives to death, and the government pursued me. Entering the demon house by mistake, I thought it was a dead end, but it became the starting point of my rise. The humiliation of the furnace for five years will be repaid a hundredfold today! This is the beginning of the hard-core path to immortality without a system or harem, relying solely on strength!