Favourite 'Strong' Lead Women in Kdramas

Avoiding some cliche tropes that kdramas present of naive and/or gullible, submissive women in dramas, here are my favourite strong female leads, they don't have to be consistently strong, but they have to be strong as characters and developed reasonably well instead of appearing shallow. Some of these lead girls I mention are at times naive and gullible, but the reason they're on this list is because there's more to them than that and they have their strong side and character development.