I don't think It's a good idea to debut Tiara in Japan right now because they still have to settle stronger here in Korea first.
But since it just for five days, I'm not too worry for now.
Moreover, after what happen to Cho Shin Sung, I'm affraid by Mnet : except for the fast promotion of TTL,
they still don't show up in Korea and It has been years since I'm waiting for their comeback !
And why do everyone decide to attack the japanese market in the same time ?