Garbage Cans for Used Toilet Paper
Some older buildings can’t handle flushing toilet paper as it will clog the toilets. So sometimes there will be signs attached to bathroom walls asking you to throw away your used toilet paper in a garbage can. These cans are usually to the side of the toilet and are usually filled with everyone else’s used goods for the day. This Korean culture shock is yucky, but if you don’t follow the rules, you might be the jerk that clogged the toilet.
Tip: These older toilets can KINDA flush toilet paper, so you can take a chance. But it is extremely risky (and of course rude if you’re unlucky!).