I was enjoying it till chapter 72. I can't get pass the illogical setup. The MC at 9th level Qi Refining, was captured by a being who can kill golden core monster in a blink of an eye. Though weakened, this being sucked the blood of MC to recover a little bit. Now, they sign contract to exchange blood for guidance. The power disparity is so wide, why sign contract? The prior 72 chapters, the author established how ruthless immortal cultivators are, now the MC suddenly met someone who is so powerful but willing to treat him well instead of treating him like a blood slave? What gives?