Su Wan, an introverted design genius, impulsively marries a blind date at first sight to maintain her low-profile persona, without even remembering her husband's full name. The next day, a seemingly adorable and clueless intern suddenly joins her department, and she's assigned to mentor him. But when she looks up, she notices that the red marriage certificate in his pocket looks exactly like hers! Desperate to keep their relationship secret, Su Wan reluctantly plays the role of a seasoned senior, while Lu Xingyan deliberately pretends to be incompetent to get her guidance. As their hidden identities are gradually exposed, one embarrassing moment follows another. Until one day, Su Wan accidentally catches Lu Xingyan holding a board meeting on the rooftop. It turns out that the adorable 'newbie intern' she's been mentoring is actually the group's CEO—and her very own secret husband!