What drama that you think I should definitely have to watch ?

D-Day (I saw that you don't like Med dramas but it was on your plan to watch and I thought it was really good)

Incomplete Life

It's Okay, That's Love

Remember - War of the Sun (It's still ongoing, but it definitely keeps you wanting to watch more)

The Lover 

Good Doctor
i second
D-day
Its okay its love
and
Good doctor ♥
also you should defiantly check out these that are on your ptw list :
The Princess' Man
Faith
Prosecutor Princess
The Master's Sun
Love Me if You Dare
The Moon that Embraces the Sun
Fated to Love You, Second Time Twenty Years Old, Secret, Good Doctor, I Need Romance 3
The Princess' Man - This is my favorite drama of all-time, I was anxiously nail-biting over what was going to happen next with each episode. I binge-watched it in 2 days (it's 24 episodes). 

Others you should consider (in order of how much I liked them):

The Master's Sun
Scent of a Woman
The Greatest Love
I Hear Your Voice
Secret
Coffee Prince
Full House (Thai drama)
Love Me If You dare (Chinese drama)
Witch's Romance
Pinocchio
You missed a loot since you haven't watched 1 Litre Of Tears yet .. It's a must to watch this one (: