When Emperor Xiao Jinyu of the Great Xiao Empire learns that the Crown Prince has been betrayed by his betrothed, he rushes to the post station. There, he discovers that his son's betrothed has joined forces with powerful cultivators from the Immortal Sect to humiliate the Crown Prince and force him to break off their engagement. At this critical moment, Xiao Jinyu awakens the Strongest Child-Protection System: the stronger his enemies become, the greater his own cultivation power grows. He strikes back decisively, breaks off the engagement on his son's behalf, and slays the Immortal Sect's experts. However, his actions attract the attention of the Immortal Sect, and even more powerful forces descend from the heavens. Father and son are forced to face the incoming threat together, beginning their journey of turning the tables through a father's unwavering protection.