Class A has a couple of top students, while Class F has a couple of underachievers. One weekend, they all stay together in a guest house. The underachiever entered the wrong room and the top student ended up sleeping with the wrong person. Since then, the fates have reversed and intimate relationships have been misplaced… The male lead is a top student, the female lead is an underachiever in both the main and secondary couples, two couples in total. This is a story with a happy ending, without moral or ethical considerations, purely for entertainment.