Ghost Game, I Can Extract the Sequence

Lin Yao's sister disappeared, leaving him only a game link. The bell rang in the early morning, and Lin Yao entered the game, but the game told him that his sister was dead, leaving him a sequence lottery system. But the next second the system prompt told him that his dead sister had targeted him because she discovered that the system host had changed, and asked Lin Yao to pay attention to his safety...