Some people transmigrate, but not completely.
His younger sister transmigrated with him, and since they shared a System, they spent several years waiting in Earth's unified transmigration passage until she finally arrived.
The siblings transmigrated to the Three Lights Continent, where they became the Grand Elder and Sect Master of the Yingyue Sect.
"Master, the junior sister was almost tricked by a scumbag!"
Qin Shiguan: "He dares bully a disciple of my Yingyue Sect? Students, get him! Beat him up! If he dies, he deserved it. If he lives, then he got off easy!"
"Master, the junior brother's engagement was called off!"
Qin Shiguan: "What? Send word that the Holy Maiden of the Holy City is to marry my youngest disciple."
Qin Shiguan: "I don't want to play favorites, but they call me Master!"
