Shian is a woman whose boyish looks attract her attention from other women who think she's much more attractive than the average guy. However, she struggles with two issues, an extreme fear of men and excessive meddling from her mother. Suddenly appearing before Shian was beautiful college junior Ritsuko. As kind-hearted as she seems, she's actually an obsessive stalker who has feelings for Shian. Meanwhile, Shian starts working part-time at a women's cafe, where she meets head chef Hasumi Yuushin. Although he is a man, she realizes she doesn't find herself panicking around him, but beneath Hasumi's true facade is that of a playboy. She seeks help from Hasumi to overcome her fear, however, Hasumi proposes mediating between her and Ritsuko as a condition, and the two of them form a 'secret alliance'..." Adapted from the webtoon "Secret Alliance" (시크릿 동맹) by Lero (레로).