It's similar in the sense that both main characters sorta share the same dynamics.

In Hidden Love, ml was sort of a brother figure to her before actually becoming her love interest and similarly in YAMU, ml was also an older brother, guardian figure towards the fl before romance actually bloomed between them.

Both dramas are very fluffy, light-hearted, big on family dramas! Though YAMU might be a bit more angsty, both of em are still the best if you're in the mood for a fun, funny and sweet drama!

It is similar in terms:
-that both male leads are immortal
-that the female leads are the only one that can aid them. In Goblin, the fl is the only one that can help ml obtain death while in IAMTYYATS fl is the only one who can suppress ml's mutation.
-in Goblin, ml has 1 whole family generation that looks after his every need and also in IAMTYYATS, ml also has a whole family generation looking after his every need.
-both dramas ml are filthy rich
-both portray a older man/ younger female dynamics
-both fls are very outgoing and cheerful