There are three spys are sent on a mission and they are Noh Yunah, Hokazono Iroha and Bang Jeemin from the Company PRO from Huh Yunjin and Kim Chaewon(Protection rare organization) to solve the case of missing Heesung and Jay.Their targets are Park Minju, Lee Wonhee and Sakai Moka in the school called SIS ( Seoul international school 🏫). The spy trio thought this mission was like any easy mission expect it was messy and the hardest mission they have ever face.