눈물나다(nun-mul-na-da, nunmulnada)
Expression indicating tears flowing from the eyes
When to use
When moved emotionally, When eyes are irritated, Tears without active crying
The nuance
Used when tears come out due to strong emotions or irritation; can be used even if the person is not actively crying.
울다(ul-da, ulda)
To express emotions by crying with tears and often sounds or actions
When to use
Actively expressing emotions, When sad, When joyful
The nuance
Used when actively expressing emotions like sadness or joy, always accompanied by tears.