Dramas with an introvert ML?

You know,  where he is ok with spending a lot of time alone, not talking to other people, just keeping to himself. Any genre is fine. I find Non-Korean dramas really underrepresented so even better if you list these.

Shows I watched and fit the decription:

Partners for Justice

Another Miss Oh

Stranger

Where Stars Land

Le Coup de Foudre (2019)
A Love So Beautiful (2017)
Because This is My First Life (2017)
Touch Your Heart (2019)

In addition:

• Misaeng
• Do you like brahms
• Come and Hug Me
• A Poem A Day
• Find me in your memory
• Bride of the Century
• Moments at 18
• Snow White
• Tree of Heaven
• Holyland
• Mask
• Snow Queen

Also here are for the Non korean drama:

• Japan
  • Code Blue 
  • Kingyo club
  • 1 liter of Tears 
  • Tonbi
  • Maou
  • Good morning call
  • 100-manen no Onna-tachi
• China
  • Put your head on my shoulder 
  • Go go squid
  • Kings avatar
  • My sunshine 
  • I hear you
  • Ten miles of peach blossoms (wuxia) 
• Taiwan
  • Wake up
  • Love Now
  • It started with a kiss
• Thailand
  • Piang Chai Khon Nee Mai Chai Poo Wised

https://mydramalist.com/472-kekkon-dekinai-otoko

And its sequel