Was having a kopitiam discussion and someone express that a more laychay loop hole for subletting is not explore. That is to rent the fate first n then do paperwork of adding more people into the flat via the hdb updates for people staying there. Then the main tanant move out n collect rental income for the room. Is it a must for the main tanant to still stay there if the original tanant can move out and collect more rental from subletting the rooms out?