Hae-sung is caught off guard when he recognises Soo-ah's childhood name, Bong-ja, which stirs memories of his first love and distracts him from his focus. Despite the emotional turmoil, Hae-sung pushes forward with the mission to uncover the secrets behind the third ghost story. However, a missing key component forces Soo-ah to join the mission despite Hae-sung's strong opposition to her involvement.
수아(진기주)가 첫사랑임을 알게 된 해성(서강준), 가슴의 두근거림을 애써 잠재우는데. 이사장실 잠입을 위한 둘의 본격적인 공조가 시작된다..!
