Similar to:
1- My Mister
2- Lost
3- Chocolate
4- Itaewon Class
5- My Love Eun Dong
6- Mask
7- Shining Inheritance
8- Secret Love
9- The Innocent Man
10- That Winter The Wind Blows
11- Come and Hug Me

  • When the Weather is Fine
  • Do You Like Brahms? 

I am not sure if it is exactly what you are looking for but here goes:

-Kairos; - Just between lovers; - Prison playbook; - Secret; - Sell your haunted house;

Doom At Your Service

  • The Princess' man
  • Flower of evil
  • Breakup Probation, A week(Its basically a movie divided in parts)
  • Doctor Stranger(kinda)
  • Happiness
  • My Beautiful Bride(This one is very good)

Jejoongwon- it's been a while but I remember this being really sad but it does have a happy ending

KDramas with significant sad or serious elements (similar to your examples) that have a happy or satisfying ending:

KDramas with sad / serious elements that have an ending that is partly open or a little bittersweet, but mostly happy:

Sorry, I Love You,  Autumn in my Heart,  Shark, Saimdong, Padam, Padam ,  Chuno, Can you Hear my Heart,  A Thousand Day Promise, Uncontrollably  Fond, The Smile Has Left Your Eyes, 

 A lot of Good shows are listed Here on this response list!!! Watched Most!!

My personal favorites: 


Goblin

Someday or One Day

Angel's Last Mission Love

Love Exposure

It's Okay That's Love

The Handmaiden

Move to Heaven - has a similarish take as Itaewon Class, also very very very sad
Moon Lovers: Scarlet Heart Ryo - follow the romance dramas you have on your list. There is humor in the beginning but the longer the drama is, the more tissues are needed



Sweet Home Sweet Honey