It's a wonderful peak into how languages might have evolved in the past.
One day a bard is passing through some village or other and, having recently traveled to the far east, tells stories of the reclusive hikikomori of Japan. A young fella at the tavern hears the stories and is inspired to grow up to be a bard himself so he too can travel to the far east. But! He goes a little too far south and - mistaking the Yellow Sea for the Sea of Japan - swims across to the Korean peninsula bringing an invasive new word in his pocket.
One day a bard is passing through some village or other and, having recently traveled to the far east, tells stories of the reclusive hikikomori of Japan. A young fella at the tavern hears the stories and is inspired to grow up to be a bard himself so he too can travel to the far east. But! He goes a little too far south and - mistaking the Yellow Sea for the Sea of Japan - swims across to the Korean peninsula bringing an invasive new word in his pocket.