Except that the duo didn't have a abusive relationship.
Bonnie and Clyde are somewhat abusive, but they lean more on a toxic relationship, I say Sangwoo and Bum are more like Quentin Tarantino's Mickey & Mallory.
They're not natural born killers though nor is Yoonbum who would kill someone like Mallory does nor do Mickey and Mallory have a abusive/toxic relationship
That's why the OP said they are similar, not the exact fucking same.
They're not similiar either way.
This reminds me a little of bonny and clyde. two souls who arn't understand by society found each other.