I'm in need of a drama with a dark romance and lots of heartbreaks.
Something calm and slice of life where I have tears in my eyes while watching.

I just finished Hirugao and I want something similar to it in terms of feelings.

Your plan to watch list has a couple that I've watched and would recommend. 

Kenja no Ai

Last Friends 

Kuzu no Honkai

Tomorrow I will Date with Yesterday's You (omg heartbreak city!!)

Two Lights: Relumino (no heartbreak but a beautiful short story none the less)

When a Man Falls in Love 

Second Last Friends and Kuzu no Honkai

You can also watch

  • Que sera sera
  • Byakuyakou (which its on your PTW list)

Last Friends

I'm Sorry, I Love You

Scarlet Heart Ryeo

Cruel Romance

Sound Of The Desert

 Otps4Life:

Scarlet Heart Ryeo

Cruel Romance

Sound Of The Desert

Innocent Man aka Nice Guy

N no Tame Ni

YongPal