Martial arts immortality, I will eventually be invincible

【No system + invincible + cool story + no heroine + fantasy】
After Chen Guanlou gained immortality, he got a stable job as a jailer in Tianlao and started his days of slacking off at work.
In the long years, I watched him build a tall building and then it collapsed. I watched him ascend to the throne today and become a prisoner tomorrow. I watched his family become rich and powerful and then he exterminated his three clans. I watched him become rich and powerful and then his country was destroyed and his family was ruined.
What changes is the years and life, but what does not change is the immortal years. Chen Guanlou outlasted the masters, the great masters, and the big guys, and finally became an invincible existence.