Sometimes, a person would not do something 100% rationally; for instance, Zhang Tie set free a great number of slaves this afternoon.
Perhaps it was out of his appreciation towards life, his pity for those slaves, or his selfish desire to earn a fruit of redemption.
Thus, Zhang Tie spent over 1,000 gold coins to set free a number of "cheap" slaves. In many people's eyes, at least in the eyes of Davinci, Zhang Tie was a spendthrift who didn't know it was very hard to make money.
Upon hearing that Zhang Tie had a castle, Davinci naturally thought it was built by Zhang Tie's clan for him. As a guy who was qualified to have a castle on Hidden Dragon Island and surnamed Zhang, undoubtedly, Zhang Tie must be a key apprentice from the leading clan of Huaiyuan Palace.
Davinci believed that he was right. Although Huaiyuan Palace was very large, few young men could buy hundreds of slaves at the price of tens of thousands of gold coins without any hesitation like Zhang Tie.
