"Child." "Let's make a deal." The next thing he knew...he shrunk! And wait, I have a baby brother!? This baby brother of mine seems weird (In which Cale did not transmigrate in the body of Kim Rok Soo but only regressed instead. And Rok Soo got reincarnated as his brother.)

Cale Henituse isn't mortal, let alone human. Moreover, he was dying. Kim Rok Soo suddenly found his slacker dream far much harder to achieve. Please note: this is a fanfiction and the rights of the characters and original story belong to the author. Please support them by reading the original works. Thank you. ****** Based on a Fanfiction One Shot by Luna_Scinx (SciFell_Goddess) (Permission has been given to use their idea.) One Shot title: Luminous