Late at night, a medical clinic is suddenly targeted by aggressive medical disruptors. Nurse Xia Wanqing faces threats without taking a single step back, while Jiang Yegui steps forward to protect the clinic. Afterwards, the two share night shifts together, rescuing patients, exposing workplace framed plots, and preventing the malicious seizure of the clinic, using medical skills to save lives and evidence to guard justice. Xia Wanqing gradually falls in love with this responsible unemployed man, unaware that he is actually the heir to the Jiang Medical Group. After his identity is revealed, the stark disparity in family backgrounds makes her hesitate for a moment, but Jiang Yegui uses his actions to tell her that a healer's value is never measured by wealth. From saving lives side by side to knowing and guarding each other, they consistently hold fast to kindness and original intentions, letting benevolent hearts light up every late night.