Summer Time Machine Blues

Five college friends, members of a sci-fi club, spend their time lounging, playing sports, and relaxing at the public bath. Their lives take an unexpected turn when they accidentally damage the air conditioner's remote controller. As they try to fix it, a time machine suddenly appears, and they decide to use it to go back in time and retrieve the controller. However, as they navigate the past, they begin to worry about the potential consequences of changing history and wonder if they will indeed disappear like in movies.