Wait for the night after a day to go to the cliff near the boundary monument of Jietian Road to check the lantern to trigger the soliloquy dialogue.
Wait for the night one day later to view the lantern to trigger a conversation with Xu Ji, and then wait one day later for the night to talk to Cai Hong from Wu to Hai Shi.
At night, go to the cliff in front of the boundary monument of Jietian Dao and talk to Xiao Yueya. Next to Xiao Yueya and Awu, use the magical Yinghuo Huiye to trigger the subsequent dialogue. You can complete the two knowing things of Yinghuo Weiwei and Zhuhuo Huanhuan.
At night, go to the cliff next to the boundary monument of Jietian Dao and talk to Xiao Yueya. According to the clues, you learn that you need to help Awu in All Things Know-Zhuhuo Huanhuan.
After the conversation, wait until night to use Calestial Seize and Moon to steal the key from Pan Kui, and use the key to open the door during the day and talk to Little Crescent Moon.