ANSAN, South Korea (AP) — Park Si-chan had trouble sleeping the night before the biggest trip of his young life, a four-day journey with his entire junior high school class to a lush volcanic island known here as the “Hawaii of Korea.”

The trip was the students’ last chance for all-out fun before preparing for grueling, all-important university entrance exams, and Si-chan was excited. While packing, he kept saying, “‘What am I missing?'” his father, Joseph Park, recalled.