Let me know if you also want movie recommendations! Revenge as the main theme is bolded:
High School King of Savvy
49 Days
Cheese in the Trap
High Society (the revenge aspect comes much later in the show though)
I Hear Your Voice (revenge also appears later)
It's Okay, That's Love
I Remember You
Queen Seon Deok
School 2013 (idk if this counts though tbh, it's like between friends and idk probably not what you have in mind)