Twenty-eight-year-old Sheng Kai Xin is bankrupt, unemployed, and being chased by debt collectors. Standing at the lowest point in his life, he finally finds a job, but with it, he also encounters an inexplicable event. On his first day at work, he stood nervously at the villa's entrance, clutching his custom-made suit. The moment he saw CEO Sen Ho, he was struck dumb... That cold, handsome face was unmistakably that of his childhood friend, Gu Yi Sen, who had disappeared without a word ten years ago. Gu Yi Sen looked at him like a stranger as he immediately tried to fire him, beginning his arduous journey of tormenting Sheng Kai Xin. However, "happiness (kaixin)" was the key to Sheng Kai Xin's life, and many absurd and hilarious situations unfolded between them.