I'm looking for dramas where the lead (male or female) was really hurt in the past by an ex or something in the past, and now when the meet someone new, they learn to love and trust again.

ALL COUNTRY RECOMMENDATIONS WELCOME :)

It's Okay That's Love (Korean) and Mars (Taiwanese). 
Great suggestions, but unfortunately I've watched (and loved) both of those dramas 
I was going to suggest "Heart to Heart" but you saw that one.

How about "The Snow Queen"?
There is a new mini-drama that just started called 'I Order You' that's like that, you can find it here: http://www.dramabay.com/i-order-you/#videos enjoy :)