The five people jointly determined that only by finding Zaina can the mystery be solved.Byung-jin revealed that Jae Na held the fake ID card he was looking for and belonged to Soo-jin in his hands, and explained the urgency of finding Jae Na.But at this moment, Jae Yi received the news that Jae Na had passed away. She and Seqi immediately took Bingzhen's car to the hospital mentioned in the notice.

Facing the body of Jaina whose face was so damaged that it was unrecognizable, Jae Yi was deeply hit.Seqi hugged Zaiyi tightly and comforted her softly: “ Zaiyi, it's not your fault.”Seqi noticed burn marks on Na's instep, which reminded her of the nursery senior Xiuzhen, who also had the same scars, so she began to look for Xiuzhen's traces.At the same time, Yili and Choi Kyung found the residence of Jae Na before her death - an examination house.

Although the three people tracked different goals, fate led them to meet unexpectedly in the examination hall.Seqi learned from the other people that Soo-jin had passed away, while Yeli and Choi Kyung used the keys they found in the medical club room to open Jaina's room.In the room, from college entrance examination math killer questions to various difficult questions, the walls were filled with densely written, and the scene in front of them shocked the three of them.