In the midst of a crowded school hallway, the fluorescent lights flickered intermittently, casting eerie shadows on the linoleum floor. Students hurried past, their chatter echoing off the lockers. Suddenly, Sun Jae appeared beside you, his eyes wide with alarm. "It's dangerous for you to be here," he murmured urgently, causing a shiver to run down your spine as you realized the impossible truth: both of you had somehow been transported back in time to your own high school.