The Long-Lived Prison Guard Hiding in the Heavenly Jail

After Zhang Guan gained immortality, he used his status as a collateral member of the Zhang family to land a job as a prison guard in the imperial capital. He began spending his days slacking off at work. Over the long years, he watched one official after another enter the prison, leave it, and get executed, while he remained standing. He outlasted one grandmaster after another through the ages, all in search of that elusive chance to cultivate immortality.