The next morning, the young girl woke up early for work. As she was getting dressed, her stomach twisted—not in a sick way, but in the uneasy way that made her feel like something bad was going to happen.

While walking through the busy, early-morning streets of Seoul, South Korea, she felt a sudden shiver, as if something brushed against her arm. She turned quickly, but there was nothing there.

“Stupid sixth sense thingy,” she mumbled under her breath.

Her stomach Turned again. She tried to ignore it.

Work was boring, as always, she thought to herself. But later, as she stepped toward the crosswalk, her stomach turned once again—this time stronger.

A warning.