Psychological Mysterious Case.

Summary

The passage details a complex investigation involving Su Yun and Song Ao Yue tracking down a mysterious letter writer. They discover Dr. Edward Hao Sen, who reveals he was a ghostwriter for a letter sent to Su Yun's sister Eathelin. The investigation leads them to Room 3104 in West Mountain Hospital, where they unexpectedly find Wang Ze Yang, a previously mentioned serial killer, as a patient. The story revolves around uncovering the true author of a love letter, with intricate connections between a doctor, a serial killer, and Su Yun's sister, creating a suspenseful narrative of mystery and revelation.

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