I'm looking for dramas where two dudes start out hating each other--or enemies--and slowly become close friends.

Some examples that I watched and loved & definitelly recommend to others:

goblin

Strongest Deliveryman

Mysterious Lotus Casebook

many thanks for considering my request.

- The Devil Judge (100% recommended)

- A league of nobleman

- Weak hero class 1

- The Fiery Priest (this is ml and fl not 2 man)