I'm Your Older Brother [Quick Transmigration]

This story is also known as "The Good Big Brother System" For my scatterbrained little sister, I'll help her come to her senses. For my mama's boy brother-in-law, I'll put him firmly in his place. For my mean-spirited little brother, I'll beat you so badly even your parents won't recognize you! You ask what gives me the right to boss you around? Because... I'm your big brother! And you, you're not even related to me, so why are you calling me Big Brother? But what do I do when my little brothers and sisters are about to turn evil any second now? Chi Rui, who transmigrates through three thousand worlds, says being a big brother is no easy job! -- The domineering CEO big brother of a wealthy heiress -- The eldest prince is not the crown prince -- The big brother of a former girl group member -- My adopted little brother wants to hurt people every day -- My cousin is a scheming woman -- My father is an abuser -- A bunch of idiots call me their boss -- My little brother is addicted to the internet -- My little sister is such a coward -- Taking the fall for my twin little brothers Theme: