So it's obvi ml is looking for mc so I'm assuming he saw mc in his winter coat and probably just thought that is what his beast form always looks like.
I was literally thinking the exact same thing. He's obv gonna think that pretty white haired boy is the boy he's looking for without realizing it's actually MC. MC likely has a winter coat, which is when ML saw him
So it's obvi ml is looking for mc so I'm assuming he saw mc in his winter coat and probably just thought that is what his beast form always looks like.