Hello  :D  Do you know any korean romantic comedy drama where the lead female character has short/shorter hair? 

Nothing too heavy please!! I want something romantic, lighthearted and funny.

Attention, Love!
Weightlifting Fairy Kim Bok Joo
Wild Romance
Zettai Kareshi
Lucky Romance
Reply 1994
Reply 1988
Goblin
Healer
Secret Garden
The World that They Live In
Another Miss Oh
Kill Me Heal Me
Coffee Prince (the girl pretends to be a boy, so she has very short hair)

Anything with Gong Hyo Jin, she always has short hair and plays awesome female characters! (ex. It's Ok That's Love, Jealousy Incarnate, Greatest Love)
Kill me heal me
Can you hear my heart
Healer
Hearstrings
Cinderella and the Four Knights
You're beautiful
The liar and his lover
The greatest love
Bok Joo

Strong Woman

Healer

Goblin

Secret Garden and King2Heart?

Coffee Prince

Beautiful Mind (more focus on medical drama though)

Proud of Love (a bit of slapstick comedy, don't know if you like "comedic" sound effects)
Healer
Reply 1988
Strong Woman Do Bong Soon
Cinderella and the Four Knights
Goblin
Weightlifting Fairy Kim Bok Joo
You're All Surrounded (not at the beginning, but after a few episodes)
Rush To The Dead Summer (aka. Love At The End Of Summer)
My Father Is Strange
My favourites:
Weightlifting fairy Kim Bok Joo
Lucky romance
Coffee prince
coffee prince
healer
kill me heal me
Strong Woman Do Bong Soon
You're beautiful 
To the beautiful you
Strong woman do bong soon
Weightlifting fairy Kim bok joo
Cinderella and the four knights
Coffee prince
My fair lady
Secret garden
Boys over Flowers
Lucky romance
Kill me heal mel
Healer
beautiful gong shim (not sure)
Girls' Generation 1979. It's more a youth drama but still, there's some young love involved.