I solved this thing last Saturday morning.
Total five JPN guest check-in & out in same time stay in this hotel for 2night(23-25OCT)
And first night (23-24OCT 1NT) guest book in use OTA(not know well)
2nd night one of five guest Mr Matsushita san use our booking
(And we've already paid room rate to hotel in early time)
Cause hotel cant find other 4 guest(not our JHC guest)'s room rate payment certification.
And they four even has no emergency contact way,only our vouche has emergency way,
so they use our Voucher's Emergercy for help.
(We just help them!!)
Confirmed with Front desk Ms Xing,it's not our and our guest fault,
but other four guest 's travel agent fault.
(mistake in transfer room rate certification)
Finally they have all check out before 09:30am successfully.