KageHina's manga / #Professor(1)

Park Hajun x Kang Shihyun (Yejun) - 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!