In her previous life, Lin Wan helped Su Yao sign the attendance register on her behalf when Su Yao was absent overnight. Su Yao then turned against her, forcing Lin Wan to pay 50,000 yuan in compensation, lose her overseas exchange opportunity, and get expelled. Lin Wan subsequently died in a car accident. After being reborn, she pretends to agree to sign for Su Yao while secretly reporting her absence through the system, sending four consecutive messages and taking screenshots as evidence. Su Yao files a false police report and plays the victim, while manager Wang Jianming pressures Lin Wan to withdraw from school. Lin Wan livestreams the timestamps, call records, and screenshots showing the system has marked her messages as read, turning public opinion in her favor. The police confirm that Su Yao shared a hotel room with her boyfriend and establish that she filed a false report. Su Yao's mother hires online trolls, Su Yao edits an audio recording, and Gu Yuan files a report against Lin Wan, but Lin Wan counters every attack with evidence. In the end, Su Yao is expelled, Lin Wan regains her eligibility to study abroad, and electronic attendance signing is implemented for everyone.