Crack the Code!

This cryptogram is of "normal" difficulty because it has kept all its spaces, but there is no hint.

Good luck!

A :
B :
C :
D :
E :
F :
G :
H :
I :
J :
K :
L :
M :
N :
O :
P :
Q :
R :
S :
T :
U :
V :
W :
X :
Y :
Z :

Frequency Distribution of Ciphertext

 

Frequency Distribution of English

Project by Leo Feng, This toook so much time