Solving the Case is Slightly Bitter, My Sister is Super Sweet.

Summary

A horror comic about a class reunion where Yang Cheng seemingly poisons his classmates who previously bullied him. After scolding his ex-girlfriend and letting her leave, the other attendees are found dead. The girl later discovers Yang Cheng's potential involvement but hesitates to report him. Eventually, she is found dead, and Yang Cheng appears to escape justice. However, in a supernatural twist, a mysterious figure haunts him in the office, forcing him to commit gruesome self-harm through unexplained supernatural manipulation, leaving the true nature of events ambiguous and chilling.

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