Malloc got sick
So this is for anyone who may have a cat, in case it happens to them. Last night around 9pm when I was going to have dinner, something strange happened to him. He was sitting on the couch next to me just having that usual cat "licking session" and he started doing this:
It was crazy and just kept on going. I called our vet (Uncle Jang) and sent him the video. He asked me some questions, like if we have any plants, did Malloc eat anything strange, was it hot (AC was on all day Sunday), did Malloc go to the toilet and pee. Nothing seemed to fit, though he only had done 1 pee in his toilet in the previous 20 hours or so.
Malloc calmed down, then started up again about an hour or so later, so finally I took my vet's advice around 11pm or so and raced across Seoul to a 24h vet (Western Animal Clinic). $300 or so in bills and being up until 4am later I know what's wrong. Malloc seemingly has FLUTD. Or more specifically his bladder was swollen and he couldn't pee, probably causing lots of pain and maybe stopping him from pooping too. The vet did a urine sample test and there was blood and white blood cells in it indicating FLUTD. The vet drained his bladder and has given me antibiotics to give to the poor fluffkins for the next week. He's definitely behaving better now and has already peed and pooped in his litter box.
So if you have a cat, especially a male, as this seems to be far more common in males, check the litter box regularly to see if they are using it as normal, and note that foaming behavior like above can be a symptom of this. If it happens, rush to the nearest vet and get it fixed. Your little fluffball is probably in severe pain but is unable to tell you.
Thanks to the vets above, Malloc is now happy and relaxing. I'm a bit tired but relieved.