“两年后回来”的承诺，被前一部作品转移到了福岛，成为了故事的轴心。虽然直子知道这个承诺是一个谎言，但他一直在等待并相信。就在5年前，还有一个略有不同的第五年暑假。
"； Do you want to do this; Fatal temptation... Challenge Game : The floral artist Ae-ran (Vicky) and forensic investigator Min ho (Choi Ryeong) from the prosecutor's office both have a family that everyone wants. However, Min ho cannot control her sleeping time, so Ae-ran begins a challenge game in which she seduces unfamiliar men and has sex with them. One day, Ae-ran and Min ho met Alex (played by Choi Hyun ho) at a tango caf é. Alex is interested in and approaches Ae ran, who is more handsome than her husband Alex. Min ho later witnessed their actions and was very angry when he found out that the man Ae ran was luring was Alex. Min ho felt nervous because he realized that Alex was not just a competition partner, so he came to him for a reason. Min ho tried to get rid of Alex, but Alex even grabbed Ae ran and Min ho, feeling the release. The game they started is turning into a disaster...
