Is This the Battle for the C Position?.

Summary

In a silent night, Ye Xiao Qi offers to accompany Shang Cai eastward to leave a forest. After a journey, they reach a wasteland where she warns him of a highland exit before swiftly returning. Alone, Shang Cai reflects on his luck when suddenly, the ground cracks beneath him, causing him to fall into an underground river. Despite the fall, he remains uninjured and decides to follow the river for an exit. He discovers a cliff where the river turns into a waterfall, surrounded by glowing crystals. Although weary, he chooses to rest near the waterfall, unaware of the dangers lurking in the darkness around him.

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