I'm an Undercover Agent in the Demon NationI’m an Undercover Agent in the Demon Nation; I Am an Undercover Agent in the Demon Country; Wǒ Zài Yāo Guó Dāng Wò Dǐ; 我在妖国当卧底; Wo Zai Yao Guo Dang Wo Di

By a twist of fate, the male protagonist is chosen as a spy and sent into the Demon Nation to obtain intelligence on the Heart of the Demon Mother. To blend in, he deliberately approaches the female demon Bai Ling, which leads him to join a faction composed entirely of female demons. As the only man among them, he seems to be both the hunter and the hunted.