The Princess' Man | period drama with emphasis on romance. They do get together almost at the beginning, but there's several people trying to keep them apart (including the second male lead).
Suspicious Partner | the leads get together about halfway through the story. There's a girl (ML's ex) that tried to get in between them but it doesn't last.
Kill me, Heal me | ML has 8 personalities. Though the leads get together halfway, two characters are opposed to the couple (one of them is one of ML's personalities).
While you where sleeping | they get together about halfway there. 2ML likes the FL but he doesn't really try to keep them apart, though there is a character who opposes the relationship.