why my cats are acting strange

they are korean short haired cats and i recently bought them here in the philippines.eversince we are in korea,they are so hyper active,they are nocturnals.my husband and i enjoyed playing with them but theyve broken a lot of glass,flower vases,picture frames and even push a rice cooker to fell!they can even open a cupboard and play inside!the girl was even able to open a slide opening faucet!they r just 5 months and too big for their age.my little boy weigh around 8 kilos and my girl is 6.5 kilo.how can i have them behave even for a while?even curtains r not spared to climb and so does windows and our furnitures.i use the tricks before to spray water guns but they still do climb and run a lot in the house!at night u can hear sounds like bodies r banging against the wall but its just them playing!and when we arrive here in manila,my niece wants to touch them but they r hissing at my niece.they got rabies shots anyway but everytime they see new people they hissed at them.pls help?!

All cats are nocturnal, hun, it's not just their breed. But it certainly sounds like you've got some lively kittens on your hands!

Have the male neutered and the female spayed. This will calm them both down considerably..not to mention they're getting close to being able to reproduce, and I'm sure you don't want MORE kittens.

Move breakable items to a safe place, and put child safety latches on your cupboard doors.

Play with them as much as possible during the day. Make sure they have a lot of toys at their disposal.a cat tree would be a good idea, too. Get scratching posts and cardboard scratchers, and place them around your home. Sprinkle some catnip on them to make them more enticing, place their paws on the scratchers from time to time, and praise them whenever they use 'em.