There's a girl who eventually makes the SML forget about the FL (basically SML finds love too).

In a love triangle the SML always ends up alone and sad and I hate that, I would love to watch more dramas in where there's another girl who actually loves him and I want to see him getting over his love for the fl and finding love for himself with that other girl.

I think Master's Sun has this (I haven't watch it) and the perfect example for this is the korean drama My Golden Life: Hyuk is the SML and he is in love with the FL but her sister Jisoo is in love with him. He is sooo not interested at first, but eventually falls for her.
I think Miss Panda could have had this but it was showed until the very last episode and I don't want that. I WANT TO SEE THE RELATIONSHIP DEVELOP AND HAVE A HEA.  

I'LL WATCH ANYTHING FROM ALL COUNTRIES. Thanks.

 secondarycouplesonly:

In a love triangle the SML always ends up alone and sad and I hate that, I would love to watch more dramas in where there's another girl who actually loves him and I want to see him getting over his love for the fl and finding love for himself with that other girl.

• Love O2O - He's not a very likeable SML but as he gets over his feelings for the FL he also becomes a slightly better person.
• The Story of Ming Lan - Might not be exactly what you're looking for. The SML takes a long time to warm up to his wife and doesn't really start to fall for her until the very end of the drama.

Dramas where the SML makes romantic moves towards the FL but (i) he doesn't really have much in the way of romantic feelings for her, (ii) he either quickly falls for the SFL or already had lingering feelings for the SFL, and (iii) the SFL falls for him too:

• +1 I Need Romance 3
• +1 Lucky's First Love
  
• Crash Landing on You - Warning - he dies saving the SFL in the end.
• Coffee Prince
• Cinderella and the Four Knights

Negotiator and Love Now. 

The Story of Ming Lan

An Oriental Odyssey

Boss and Me (here it's the second FL who finds love, there is no real second ML)

Coffee Prince

First Romance

Moon Lovers Scarlet Heart Ryeo (I think it's the third lead that moves on from her lol)

Put Your Head On My Shoulder

I have another one to recommend you, Rahut Rissaya, A daughter just like you, and Please love me Chinese drama : P

The love you give me

Full House ( I guess the evil SFL and nice SML get together) 

Only for love (Only the SML doesn't love FL but...he is pursued by SFL)

Twinkling Watermelon (This is a great drama but kind of in the loops and doesn't focus that much about the second couple despite them being essential characters despite that its a great drama anyone should watch not just for the second couple)

General and I