The contract Tian Wenxin mentioned is a blood covenant.
Li Feng swapped blood with the three, and the content of the blood covenant was that the three would be loyal to Li Feng for a few years. During this time, they would act at Li Feng's behest, but they would also receive cultivation resources and freedom.
This contract was not merely a slave agreement, but a contract of mutual respect. Li Feng could direct the three as he wished, but if the three felt his orders were unreasonable or too demanding, they could refuse.
However, while the three could refuse Li Feng's orders, they had to protect his life. Once Li Feng died, the three would suffer backlash from the blood covenant.
The price for this backlash was not small. While it might not kill them outright, it would seriously harm them.
Thus, the three were like grasshoppers on the same rope with Li Feng, and if Li Feng died, none of them would fare well.
