"Be a servant or a maidservant? Why should I believe you?" Xu Ping'an asked with a smile.
However, Yu Xianlan suddenly became serious and swore an oath to the heavens, "I, Yu Xianlan, swear to the Immortal Heavenly Doctrine that if Xu Ping'an helps me find the Innate Dao Principle and gives it to me, I am willing to become his servant or maidservant. If I break this oath, let my soul be scattered and destroyed."
Xu Ping'an was amazed upon hearing Yu Xianlan's oath to the heavens.
Swearing an oath to the heavens was not to be taken lightly, as breaking such an oath would result in punishment by the Immortal Heavenly Doctrine.
Therefore, for cultivators, an oath to the heavens was the most binding form of constraint.
This time, Xu Nian truly believed that Yu Xianlan was willing to go to any lengths to save his father.
