Marinate the chicken: In a medium bowl, mix together ginger, garlic, gochujang, sake, soy sauce, and eggs, and water. Add sugar, corn starch, and mochiko into the bowl. Combine. Add the chicken, massage the marinade into them, and cover.
Refrigerate this for at least 4 hours (I left it in the fridge overnight).
Heat about 2-inches of oil in a large sauce pan until the temperature is about 325F.
In a large bowl, combine flour and garlic salt. Place chicken into the bowl and lightly dust the chicken with the flour mixture.
Deep-fry the chicken till golden-brown (about 3 minutes on each side).