Itaewon Class

--both dramas have the main character seeking revenge on an injustice that they faced.
--at the end of the dramas, they both realized that there's more to it than just revenge and that it wasn't as satisfying as they thought that it would be.
--both main characters faced several hardships and adversities before they could become successful and establish themselves

MAYBE CONTAINS SPILER

main lead has a tragic past
in both of them, there is a bad chairman who ruins others life by bribing police, prosecutor or teacher
also the main character suffers from injustice
there are a lot of romantic scene

MAYBE CONTAINS SPOILER

main lead has a tragic past
in both of them, there is a bad chairman who ruins others life by bribing police, prosecutor or teacher
also the main character suffers from injustice
(not) the main villain is psychopath

Similarity on the long-term goal that two leads made with each other from their late childhood years.

Park Saeroyi's life has been turned upside down after he gets expelled from school for punching a bully and his father is killed in an accident. Following his father's steps, he opens a pub named "DanBam" in Itaewon and, along with his manager and staff, strives towards success and reaching greater heights.

Both are stories of revenge with competition of two restaurants: one already very famous and influent, but with problems caused by CEO's incompetent and spoiled son; the other new that is a mixture of passion, talent and newbies who don't have anything to do with cuisine, but who learned a lot and became very skilled. In both the protagonists have big age gap.