Zhao Hai had a plan in mind. He wasn't afraid of them betraying him. He wanted to raise them to level 9 and then bring them to the demon abyss to capture undead and dark creatures to be their summoning creatures. They would fight for them and improve their strength. Zhao Hai wanted to see how they would react.
If te Yi and the others were sincere in following him, they would naturally receive many benefits. If they weren't sincere, Zhao Hai wouldn't be polite to them.
However, Zhao Hai was being too careful this time. Te Yi and the others really wanted to become the slaves of the Buda family. It was not an embarrassing thing to be someone else's slave. The reality was just as te Yi had thought. Not everyone had the chance to be a King or a divine level expert's slave.
Zhao Hai took out a bottle of space water to help the low-level magicians of the Wigan family to level up. The high-level magicians needed to use something like God's blood.