Marketing Department Manager, Nam Jung Gi (Yoon Sang Hyun) is just too nice, so nice that his colleagues call him “Father Theresa” and “Walking UNICEF”. There is nothing that can ruffle Nam Jung Gi’s feathers. Or is there? Jung Gi’s coworker, Ok Da Jung (Lee Yo Won), who is so nasty tempered she’s been nicknamed “Fire Da Jung”, isn’t impressed with Jung Gi’s affable nature. In fact, his goodness seems to bring out the worst in her, fanning the flames of her fury at everything and everyone. Will Ok Da Jung finally push Nam Jung Gi over the edge and ignite his anger, or will he eventually be the one to cool hers?