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

Summary

Lin Xuan and his team investigate a mysterious prison, initially searching auctioned islands without success. A breakthrough comes when Tian Bo Yu describes his cell with unique details - soft walls, and sounds of wind, water, and bird calls. Lin Xuan realizes these sounds suggest a seaside or island location. He theorizes the prison might be on an uninhabited island not officially sold, potentially established illegally. The investigation shifts focus from known auctioned islands to unexplored, potentially hidden coastal territories, with seagull sounds and ocean-related environmental cues providing crucial investigative hints.

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