Irin is said to be hot-tempered and fearless—"The Devil." It’s all an act, though; on the contrary, she puts on a petty facade to protect her younger sister, Inn. However, her young veterinarian and neighbor, Namcha, couldn’t care less. No matter how spiteful she acts, his love endures. He’s loved her since they were students and has no intention of changing his heart. In fact, they were dating until Irin broke things off without any explanation. Namcha has never forgotten his first love, but Irin doesn’t believe his feelings have remained the same; Namcha makes it his mission to prove it to her. Love should be easy for the two of them, but family, work, and even friends all seem determined to tear them apart.