To everyone, Jinseop is just a gloomy, reclusive intern who works for a major corporation. However, he hides a dark secret: he's been stalking Taeyoung, his flawless senior manager, following him everywhere, obsessively hoarding every trace of his life to feed his fantasies. Then one day, Jinseop catches Taeyoung sleeping his way up the ladder for a promotion. Shattered that his “angel” isn’t so angelic after all, he decides to use the secret as leverage, and sets out to transform Taeyoung into his own personal pet...