Looking for a Korean drama with the poor girl/ rich guy theme ?!

It's a trope that is fading from frequency in K Dramas (thankfully, imo), but a couple of relatively recent ones are

A  Business Proposal

King the Land

older ones include  

The Heirs

Protect the Boss

Lie To Me

Coffee Prince

• Celebrity
• Soundtrack #2
• King the Land
• Our Beloved Summer

I am not robot.. 

1. Boys Over Flowers
2. Heirs
3. Secret Garden
4. Cinderella and Four Knights
5. Strong Woman Do Bong Soon
6. My Love from the Star.. 

Tempted (2018)

• KinnPorsche
• Last Twilight
• Queen of Tears
• 100 Days My Prince
• Bride of the Century
• Dangerous Romance
• King2Hearts
• Secret Garden
• She Was Pretty
• Strong Woman Do Bong Soon
• The King: Eternal Monarch
• The Master's Sun
• The Princess' Man
• The Red Sleeve
• The Story of Park Marriage's Contract
• Time
• W
• What's wrong with secretary Kim?
• Her Private Life
• Abyss
• My Roomate is a gumiho
• Memories of the Alhambra
• Introverted Boss
• Fated to love you
• Clean with passion for now
• The secret life of my secretary
• Where your eyes linger
• See you in my 19th life
• Goong
• Marriage, not dating
• Marry my husband
• Something about 1%
• Dali and the cocky prince
• Flower boy ramen shop
• Crazy Love
• Love in contract
• Falling for innocence
• Secret
• Noble, my love
• New tales of gisaeng

These all have class differences.