1006 (Sunoo's & Heeseung's month) 1 + 5 = 6 (Sunoo's month & My year) 2 + 4 = 6 (Sunoo's month & My year) 0 + 1 + 1 + 1 = 3 (Sunoo's year) 0111 + 03 = 6 (Sunoo's month & My year) 01 + 03 + 06 = 10 (Heeseung's month) (1 + 0) + (0 + 6) + (0 + 1 + 1 + 1) = 10 (Heeseung's month) 2001 + 2003 + 2006 = 6010 (1st num switch) My day & Heeseung's Year both 01