Li Yu was not foolish enough to not know what was on Long Yue's mind.
It was a pity that he did not know anything about slave seals.
However, he had heard from his father that a cultivator's oath was binding.
The higher one's cultivation level was, the more binding it was. Once one entered the Immortal Spirit Realm, his oath could be verified by the heavens and earth.
If one swore an oath to the heavens but did not honor it, he would suffer the wrath of the heavens and retribution.
Everyone present, including Long Yue, knew this.
Long Yue cursed Li Yu in her heart.
However, she had just abandoned all her dignity in front of everyone.
At this point, it was impossible to get off the horse.
She had to finish what she started, even if she had to cry.
Moreover, this oath was better than being implanted with a slave seal.