Drama with sad male unrequited love

Looking for a sad romance drama where the male character has unrequited love for a female, or a similar type of love triangle with a sorrowful male. Thanks!

Sad / tragic dramas where the ML has unrequited feelings for the FL:

• Time
• Misty

Dramas (which aren't necessary all that sad or tragic) where the ML's feelings for the FL are one-sided for a very long time:

• The Legends
• In Time With You
• Romance Is a Bonus Book
• I Need Romance 3
• My Fated Boy
• Go Ahead
• When the Weather Is Fine
• I Hear Your Voice

Sad / tragic dramas where at least one SML has unrequited feelings for the FL and the ML doesn't get a happy ending with the FL:

• Mr. Sunshine
• Moon Lovers: Scarlet Heart Ryeo
• The King's Woman
• One and Only
• The Princess Wei Young
• Queen for Seven Days (iirc)

Sad / tragic dramas where the FL is in a relationship with the SML but falls out of love with him and falls in love with the ML, but the FL and ML either don't get a happy ending or at the very least have to be apart for most of their lives:

• Moon Lovers: Scarlet Heart Ryeo (again)
• The King's Woman (again)
• Empress Ki
• The Imperial Doctress

Dramas where the SML gave up his opportunity to be with the FL when she had feelings for him and the ML stepped in before the SML could get a second chance, so that the SML's feelings became unrequited (and the ML and FL get a happy ending):

• Sound of the Desert
• The Story of Ming Lan
• The Romance of Tiger and Rose
• Love Between Fairy and Devil

Dramas that gave me SLS for tragic SMLs who loved the FL but didn't end up with her (while the ML and FL get a happy ending): 

• Story of Yanxi Palace
• Cheese in the Trap
• While You Were Sleeping
• Who Are You: School 2015
• True Beauty
• Sungkyunkwan Scandal
• She Was Pretty