I am sorry but whats a transmigration?
It’s when you switch bodies/souls with someone. In this case the trope includes truck-issi and finding yourself In the body of a character of a book/game you last read or played. Sometimes it’s now being in the body of a dying prince/ tyrant of feudal times in some kingdom. It’s just a trope used especially in Asian plots across the board likely because of the various Buddhist sect religions, Taoism, etc believe in reincarnation.
Getting hit by truck*^ then dying and living out a second chance at life. Sometimes you don’t even change bodies you just end up in an alternative world and timeline altogether but in your same body.
spoiler:
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fam the black uke is a transmigration little bitch