Saudade' (Portuguese) - the love that remains after after someone is gone. It can describe an emptiness, like feeling the absence of someone who should be there at a particular moment. It brings sad and happy feelings all together, sadness for missing and happiness for having experienced the feeling.
'Han' (Korean) - It's been described as "a state of mind. Of soul, really. A sadness. A sadness so deep no tears will come. And yet still there's hope." Its a feeling of unresolved resentment against injustices suffered, a sense of helplessness because of the overwhelming odds against one, a feeling of acute pain, and an obstinate urge to take revenge and to right the wrong—all those combined.