This is just a game. Everyone is watching the game happen, waiting for the game to end or be terminated. Xu Diyan is also in this game, and is the protagonist who is being kept secret.
Chen Yu looked at Xu Diyan, maybe she was looking at someone, or maybe she wasn't looking at someone. She hadn't walked through the road blocked by the fog, so no one knew what it looked like.
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Only Xu Diyan knew about it in the game. He looked at Chen Yu as if he was looking at a shadow.
Ps: main article
Purpose: What is regarded as a treasure must be protected.