Immortal Forensic Doctor: Kowloon Ice Room

The ninety-nine are unified, which means eternal life. He is the human medical examiner of Night Vale City and the immortal medical examiner in the world. Uncovering the mystery of the ancient sheepskin scrolls and deciphering the secrets of the Nine Palaces, his immortality put him in a dilemma. He can walk even though he is in the fire, he can walk freely even under the fence of others, he can search for news at sunset gate, but he can't ask about Dongchang star when he is cold. What is the purpose of these lines? Who did he see at the end of the puzzle in the Nine Dragons Ice Chamber of the Immortal Forensic Doctor?