Zhao Hai was still researching the art of engineering, but the information he had on it was too little. Hence, he could not explain it to Yan Bei. He could only say, " &Quot; I don't know much about the art of engineering, but I'm sure the Shenji sect will use some of it on their puppets. I'm now trying to reverse engineer the art of engineering from those puppets, so that I can restore some of it. &Quot;
Yan Bei nodded, then frowned and said, " &Quot; the secret realm is in the West Sea, which is behind the Western Defense line. If the enemy really breaks through the Western Defense line, they may find out about the secret realm, and it will be even more difficult to defeat them. They know that there is a secret realm there, so they will definitely attack with all their might. So, we must be extra careful in this battle. &Quot;
