On the last night of Summer Vacation Special, the members have a revenge match of table tennis. This time, they have to play with special rackets that suit the heat of summer. Who will be the loser to go on a fishing boat the next morning? Meanwhile, Detectives on a Summer Night Race begins with a guest, Kang Hoon, joining the members. They have to win hint tickets through missions before they receive a request. They can use their hint tickets to solve the mystery case.
