What’s good looking, has a stoic work ethic, and has a tendency to bark loudly? The “Mad Dog” of Sungwoon Publishing, Suh Woojoon. Tae-ryung, the newest addition to his team, strives to meet his standards but his perfectionism seems to know no bounds. Meanwhile, Woojoon’s not the only thing that’s on Tae-ryung’s mind. She’s struggling with an apathetic boyfriend and a family whose sole focus is on her invalid twin sister, Tae-in. She’s feeling suffocated as time goes by, but wait. Woojoon seems to be there whenever she needs comfort… Is this “Mad Dog” actually a good pet in disguise?