1752 Collecting Clues 4yr

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After coming out of the secret tunnel of Ying Clan's castle, Zhang Tie flew around Ying Clan's castle to seek for clues. Pitifully, besides 7 underground secret tunnels leading to different locations, Zhang Tie saw nothing else valuable. 
In his lotus-flower eyes, those underground secret tunnels were almost transparent to Zhang Tie. After searching over the 7 secret underground tunnels from the sky, Zhang Tie didn't see anything suspicious. 
The ends of these secret tunnels were all hidden in mountains, woods and lakes. Some were in a private residence; some were connected to the location of the branch of Force Emperor Immortal Palace in Redmountain City. These secret underground tunnels varied from a few miles to dozens of miles in length in all directions. However, it was normal in the ends of these secret tunnels. There was no corpse or blood in these secret tunnels. Additionally, the switches in the secret tunnels were not triggered yet, which meant that the members of Yin-Yang