I want to watch shows where the female lead's first love is the male lead or the female lead has had an unrequited love for the male lead for a long time. It would also be great if you could easily tell the FL is in love with the ML like in Reply 1994

Perfect Examples I Could only Think of 

Fight My Way (2017) - FL has liked/loved the ML for over 10 years or something like that

Reply 1994 - FL also loved the ML for a very long time

Both of these involve childhood sweethearts:

Angel Eyes

Missing You

  • Bel Ami
  • Itazura na Kiss
  • Good Morning Call
  • Heartstrings
  • Moon Embracing the Sun

Love til the End of Summer                           Longing Heart                                                               A Love so Beautiful                                                     With You                                                                          Refresh Man                                                               She Was Pretty                                                            Uncontrollably Fond                                                The Time that I Loved You, 7000 Days

Chinese Drama: 

Loving, Never Forgetting (2014)

My Sunshine (2015)

A Love So Beautiful (2017)

Memories of Love (2018)

Here to Heart (2018)

Korean Dramas: 

Playful Kiss (2010) JPN version as well

Missing You (2012)

Angel Eyes (2014)

Warm and Cozy (2015)

My Love Eun Dong (2015)

Fight for My Way (2017)

Because This Is My First Life (2017)

Temperature of Love (2017)

Grand Prince (2017) - Historical 

Come and Hug Me (2018)