2nd Degree Black Belt (yi dan 이단)
There are 3 divisions in 2nd Dan, each with their own hyung.
2nd Degree Black Belt - min 4 months & 32 classes
Advanced 2nd Degree - min 10 months & 80 classes
Senior 2nd Degree - min 12 months & 96 classes (min age to test for 3rd is 13)