Intro. Introducing the school, a seemingly perfect enclave, but there are rumors of the disappearance of students from time to time. No one cares because the evidence is not enough. Forgotten Club: Shin tries to keep the Investigation Club with only one member. He was pressured by his advisors to disband the club. Puzzle in the Club Room: Shin finds a puzzle box hidden under the wooden floor in the club room. Clue: The diary belongs to a missing senior. Shin tries to decipher the code and finds out that the senior is investigating something inside the school. Complex investigations Teammates: Shin invites two of his best friends to join the team: Lena (good at computers and social media) and Ton (an athlete who excels at stalking and self-defense). Connection: The team discovers that the senior's disappearance is linked to one of the administrative professors and the elite group of students behind the secret "club. Obstacles: The team is thwarted, stolen, threatened, and nearly assaulted, making the investigation more difficult. Confront and uncover the truth. Final Decryption: Shin successfully deciphers the diary It's a map that hides a key piece of evidence in the secret room of Club S. Rooms (And you're a new kid)