Romantic chemistry that leaps off the screen

This is going to be a vague request. But tell me your fave modern dramas with the best chemistry. 

I don't necessarily mean physical intimacy but two characters that just click when on screen. I want them to do nothing but stand next to each other and still feel butterflies. 

Things I would like to avoid (but I know I probably can't):

• meddlesome exes or family members
• love triangles
• cold male leads
• enemies to lovers