Some examples of this would be "Discovery of Romance/Love" and "Boss & Me". I also want the guy to fall in love first.

Pease: Only happy endings.

Thank You!

Protect the Boss

The Heirs

Heart to Heart
You might like Falling for Innocence, Ho Goo's Love, Heart to Heart, Hi My Sweetheart and The Greatest Love. I don't know if they're really that fast-paced, but the guy is always the one that falls in love first. Hope I helped a little!
You might like Healer and in I Hear Your Voice the guy is in love with the female lead from the beginning (but it is heavy on the drama, but the ending is happier)
My Love Patzzi - cuutest ending, only ten eps.. on DramaFever ;P 

Flower Boy Ramen Shop - he falls first but is in quite hilarious denial for a bit! xD on Hulu..