Soul contracts bind the soul itself; as long as one does not release them, no matter how formidable the other party's methods, they cannot be undone.
Even the Undead Emperor Little Yellow Chicken, who was previously merely a God King while the other was an Emperor, found himself powerless to resolve such an agreement.
To prevent either party from reneging or suffering a backlash, the Master Teacher Continent once established a definitive rule: even if one could break away from the Catalog of the Way of Heaven, it was impossible to sever a bond forged between souls!
Chapter 929