Doh Ihyeon is the ultimate corporate workaholic, but he hides two secrets: he’s a somewhat defective omega and he suffers from prosopagnosia—the inability to recognize faces. After a blurry, drunken one-night stand leads to an unexpected pregnancy, Ihyeon decides to keep the baby and brave single parenthood in secret. But his carefully constructed walls start to crumble when his superior, Seo Jeong-un, begins a relentless pursuit. Jeong-un is charming, persistent, and strangely familiar, but to a man who can’t recognize a face, his flirtations are just another workplace distraction. Can Jeong-un break through Ihyeon’s “iron wall,” or will Ihyeon’s condition keep the father of his child a mystery forever?