Cao Mo, the legitimate son of the Cao family, the largest family in the North, appears to be a playboy with mediocre talent, but in fact he has awakened the "Tianyan Sword", which ranks third among the top ten ancient artifacts, and recognized it as its owner. But this sword has a fatal flaw - it has a temper! It always likes to give up its picks at critical moments, and has to be coaxed by Cao Mo before it is willing to take action. What's even more troublesome is that Cao Mo must hide his identity, because once exposed, not only will he be hunted down by other families to seize the sword, but even the royal family who has always wanted this artifact will immediately turn their backs.
Cao Mo originally wanted to develop in a low-key manner in the academy, take good care of this arrogant ancestor, and then turn around when he was strong enough. But some people refused to let him live in peace: the third prince tested him openly and secretly, suspecting that the sword was on him; his classmate "genius girl" Su Qingyin targeted him everywhere and insisted on finding out his details; and his cousin Cao Yun who always sneered at him, as if he knew some secret.
What's even worse is that every time Tian Yanjian loses his temper, he always chooses the most critical moment - suddenly going on strike in the middle of a fight, suddenly falling asleep while controlling a beast, and even causing trouble for Cao Mo in front of a female cultivator! Cao Mo had to deal with these troubles while also coaxing this "ancestral sword". When he finally figured out the temper of the sword and was about to show off his skills, the royal family sent an unexpected figure...
