Thanks to both scubaccr and markis10 for the quick reply..

I did put two persons during the booking, but there is no place I can add the second guest name.. scubaccr is spot on about the new Greater China reward policy change.. I called customer care, and confirmed there is no way I can add the 2nd guest name online, but he was able to do it for me AFTER I've provided quite some info about the guest (date of birth, cell number, and last four digit of national id).. The rep. was surprised by the amount of info the system was asking, too..

I will call the hotel later to confirm the guest has indeed been added.. hopefully adding one guest is enough..