Well, once you learn Korean, Japanese is quite easy since they share grammar. Better do something else like Finnish.
I don't think Japanese is hard because of the grammar but because of the excessive amount of letters people spend a lifetime learning.
I actually started with Japanese and perhaps that's why I'm able to get the hang of Korean
I have learned Japanese too, however, I feel Korean is much more difficult than Japanese in terms of pronunciations.
Funny... I wrongly translated this as "Let's study a difficult language!"...