i dont understand, why does the red haired boy follow that woman's orders ?

He's most probably in love with her

There's a possibility that he has a debt in her or he owe her something. It can also be seen as if he has a crush on her or smth.

Maybe he likes her because In a chapter he had a glimpse of having sex with her if you remember.

but i don't think its that simple, they share a goal but i have no idea and I'm so confused (●'◡'●)ﾉ