NoirRoseHeart:

Do second leads count?

no

7. What happens to my family 

8.  Fight for my way

10. Come and hug me (will them being teens count?)

If yes then,

10 dramas where neither of the leads had any past relationship.

2. He is Psychometric

3. Happiness

 DeobiMars:
He is Psychometric

3. Happiness

 In "He Is Psychometric"  didn't they meet when they were younger

and Happiness, they were in high school together


Now I'm confused on whether the poster meant, have a romantic(friend) relationship or never meeting in the past

4. A Piece of Your Mind

5. Love at Night

6. Angel's Last Mission: Love

 DavisLoret:

10. Come and hug me (will them being teens count?)

If yes then,

10 dramas where neither of the leads had any past relationship.

Do you mean that both leads have never dated before meeting each other, meaning they never had a bf/gf before OR both leads have never met in the past, meaning they didn’t know each other as kids?

 I AM SHOOKETH:

 In "He Is Psychometric"  didn't they meet when they were younger

and Happiness, they were in high school together


Now I'm confused on whether the poster meant, have a romantic(friend) relationship or never meeting in the past

I thought the topic was they have never been in relationship with anyone before the Main Leads start their relationship. If it wasn't meant like that, I'll replace it. 

 emi:

Do you mean that both leads have never dated before meeting each other, meaning they never had a bf/gf before OR both leads have never met in the past, meaning they didn’t know each other as kids?

Never dated before.