both stories start out the same, the male lead is walking from somewhere and stumbles upon a stray cat somewhere.

they both have similar plots but I feel as if meow, ears up! is more for a younger audience and this summer is for an older audience.

it's really just the maturity levels on how both series are played out and how they're told.

both have a bodyguard-owner relationship trope and both main leads have strict parent guardians who care much about their safety and health. in golden blood the main leads father gets him a body guard because he's scared about his enemies (whom he won't let sell drugs in his territory) men getting his son and killing him because of his father's work, and in eternal butler the main leads gets his body guard because his parent-guardian sees him as immature and gets himself in trouble.