Hey so I couldn't sleep so :
This takes place in The Sandman but in this universe when the Corinthian eats human eyes he gets a little younger and at first he doesn't see it but when someday he wakes up as a teenager so 15-18 years old and when he tries to go back to his old self ,he can only do some minutes before he is again a teenager so now he hides from the child service and tries to find a way to go back to his original form and after some years, he finally decided to try to help Morpheus/Dream of the endless escape with the help of Hob Gadling who he meets while he was hiding from the child service in a bar and then they go to the other endless to help and while the endless try to find out why it happens,Dream is taking care of the Corinthian with the help of Hob Gadling while Corinthian is suspicious of Dream and Hob because they are now taking care of him as if he were their baby.
(I didn't watch the show but I will in the future)
Have a great day!