The 24th Anniversary of Byeongmun High School (S01E07)

Hae Seong is taken aback when he hears Su A's childhood nickname, Bong Ja, bringing back memories of his first love and diverting his attention. Even with the emotional upheaval, he remains determined to solve the mystery surrounding the third ghost story. However, when a crucial element goes missing, Su A insists on joining the investigation, despite Hae Seong's fierce objections to her participation.