Shameless

Emperor Yi Yeon is famous throughout the kingdom of Hochang for his outstanding political prowess and ruthless attitude toward sycophants. After relentlessly bullying his palace cleaners into fainting on the job, junior eunuch Yoo Yak-woo is called upon to fulfill the cleaning duties, which he enjoys to the point of being nicknames Sogwija, aka "the cleaning demon." Immediately, this young, fresh-faced eunuch and his delectably juicy buttocks catch the emperor's eye. One night, Yi yeon calls Yoo Yak-woo to his room for a very "special" cleaning service and the shenanigans begin to unfold...

(Source: Lezhin Entertainment)