Requesting for the manga: Restricted Area.
Here is the synopsis from novelupdates:
Jiang Chijing had always used surveilling prisoners’ every move to satiate his voyeuristic appetite.
Until one day, an extremely dangerous convict entered the prison—and Jiang Chijing was caught spying on him.
The watcher became the watched, the hunter became the hunted. Facing Zheng Mingyi, who closed in tighter with every step, Jiang Chijing was forced to brace his arms against the other’s chest, warning him:
“This is my restricted area. Please get out.”
