Intern Su Yan mistakenly took the cold-faced CEO Huo Ting as her real brother, acting spoiled on WeChat to ask for living expenses, while Huo Ting transferred money instantly with secret pampering. The message was accidentally exposed during the company-wide meeting, causing Su Yan to suffer social death and become his personal assistant "working to pay off debts." Thinking it was a hellish start, she discovered that Huo Ting was actually her childhood neighbor brother, a deep reunion premeditated for fifteen years. From paying off debts to fighting side by side in business wars, she made a stunning counterattack, ultimately getting proposed to at the firefly old house, as a sweet romance triggered by a misunderstanding led toward a wedding and a new life.