<□>□ust as Li□Lei and Han Mei□ei thought t□e□ had see□□□v□rything□th□ mansi□n had t□ offer,□□he□ st□mbled upon □ hid□en trapdoor in the f□oor. With hearts pou□□□ng, □he□ o□ened t□e trapd□or□and d□scend□d into a □□□k, m□sty tun□el below. As they navigat□d through the wi□ding □ass□ges,□the dim ligh□ o□ their□flashlight revealed□ancie□t□a□□i□acts□and cryptic symbol□ on t□e walls. Th□ further th□y v□n□u□ed, the more they□realize□ they □ere□□ot alone in□the tunnel.<□p>□