In the prosperous city "Tianhai" where technology and martial arts coexist, Ling Chen just wants to guard his small bookstore and live a salty life of drinking tea and reading books.
However, no one knows that this seemingly harmless bookstore owner is actually the mysterious king who makes the entire city's underground world fearful - "Yan Jun".
He single-handedly created the order of the night and isolated the hustle and bustle of the day.
Until that day, a heroic special investigator who was pursuing clues about "Yan Jun" walked into his bookstore.
When the righteous light chaser meets the dark lampholder; when the shocking secret she vows to reveal is hidden in the eyes of the gentle young man in front of her.
A dangerous game on the edge of light and darkness begins.
Should he continue to act like a mortal, or should he show his true nature as a king?
