I'm looking for a drama (preferably K-drama) with a not-so-rich male lead. I think I'm over the very rich guy and  poor girl couple for a while. What I'm looking for is kinda like Jealousy Incarnate where the male lead isn't too rich but not that poor either. Moreover he serious about work and good at it. I also like the fact that the girl works hard, independent, and not too miserably poor. Thanks in advance :D

Hi Tania, you could try I Do, I Do and All About My Romance. :)
Hi, Tania! Try watching Sweet Stranger and Me :)
Hi Tania! 

Here's what I recommend :) 

the girl who sees smell
doctors
another miss oh
drinking solo
-on going dramas-
suspicious partner
fight for my way
hit the top
We married as a job
Pride
Buzzer Beat
It's not that I cant' marry but I don't want to
Boku, Unmei no Hito desu
Can We Get Married?
Creating Destiny
Delightful Girl, Choon Hyang
Descendants of the Sun
Heartstrings
Hotaru no Hikari
Marriage, Not Dating
Nagareboshi
One More Happy Ending
Soratobu Kouhoushitsu
It started with a kiss
+1 Sweet Stranger And Me
Let's Eat
A Man's Story
+1 Another Miss Oh
Bachelor's Vegetable Store
Baek Hee Has Returned
Beautiful Gong Shim
Flowers for My Life
In Time With You
Mary Stayed Out All Night
Plus Nine Boys
Time Between Dog and Wolf
Valid Love
Witch's Romance
You're All Surrounded
Thanks! There are so many that looks interesting, I'll add it to my PTW list :D
Secret Affair is exactly what you're looking for.
Hogu's Love 
Chief Kim 
Suspicious Partner