A spin-off of Ghoul Cage. Lu Xiao-Yue Youyou
They have been dating since they were young, but after Lu Xiao was kicked out of the family at the age of 7, he happened to meet 15-year-old Yue Youyou.
Lu Xiao didn't know that they were engaged,
In a daze, he worshiped Yue Youyou as his teacher, and with her help, he finally became famous all over the world.
... A few years later, when he returned to his family, he learned that his fiancée was actually his master.