Eternal Life: Signing Through Prison in Another World

"Liu Qingshan traveled to another world to practice and became a jailer in the capital of Daqian Kingdom. Get the system to live forever and last for a long time, and also get the daily sign-in system, sign in three times a day. As long as you eat royal food, you can sign in. The bigger the official, the better the sign-in reward? The system can't fool me into getting promoted. The end of being an official is jail. I'd better just hold on to my iron rice bowl. Isn't it uncomfortable to live forever and have no worries about food and clothing? What? Are jailers also civil servants? Can you also sign in to magical secrets? But in this vicissitudes of life, the change of imperial power, what? Which dynasty and which generation only ate the imperial grain? The bound occupation is the prison department? Professional counterpart. Sign in? You... In a million years, can I stop signing it? Heaven and earth are all under my control! This entire plane is a prison!