At 4 a.m., after a long and heated night, Baek Seo-jun stepped outside. Following him were not his usual companions—Seomun Ye-jin, Han Se-hee, or Lee Ha-yeon—but rather Kang Yu-ra and Moriya Yuka.

The two women, now wearing the school uniforms that Baek Seo-jun had handed back to them, followed him shyly. The moment they stepped outside, their expressions shifted into one of fascination.

"360 hours passed inside, but only six hours have gone by out here," said Kang Yu-ra, marveling at the discrepancy.

"Even though this is the second time, it still feels so surreal," added Moriya Yuka with growing …