 Hi friends,  another nuance help please.
  " I got an epiphany! "  How do you guys say it in Korean ? 

   ^^ /*
epiphany = sudden realization or comprehension of the essence or meaning of something.

Maybe...... 
You can say " 깨달음을 얻었다" when you suddenly realize or comprehend the essence or meaning of something.

Maybe......
If you use "epiphany" as a feeling, You can say " 감(感) 잡았어" when you realize or comprehend the essence or meaning of something.