Manhwa (Korean)

Kang Sihyun is an SS rank agent from a private intelligence company. Code name: Red Candy. Intelligence gathering and even gunfights - Sihyun’s skills are something he’s proud of, but he’s actually being held up in his home country? To complete his mission, he needs to subjugate Hajun, a promiscuous gay (?), and look for a research paper! This is an erotic romance between Hajun, who knows nothing, and the secretive spy Sihyun.

Seunghyun (29 years old - Gay) officially went to work as an AR project intern.
Seunghyun in his 20s has experienced a terrible unrequited love, now he doesn't want to give his heart to anyone who works in the same field as him. But he was shaken by Kim Jongchan, a tough-looking head who was very affectionate.
Unexpected first love at the company, the first love battle in life, can Seunghyun pass safely?