Guarding the River of Time

Before time travel, Su Mu worked as a reservoir guard. Life was easy—stable benefits, daily fishing, and not a care in the world. Until one day, during a wild fishing trip, he accidentally touched a high-voltage line... And woke up in another world. After time travel, am I still guarding a reservoir? Wait—this doesn’t look like a reservoir at all?! It's the River of Time. — Description from novelcodex.org