Lin, an academically smart student, has to compete against Bank for a scholarship. When Lin realizes that her father paid tea money to the school, she agrees to help Pat and Grace with the exam answers in exchange for money.
Lin comes up with a new technique by using the clock code. The headmistress challenges Lin and Bank to compete against each other in a TV game show to determine who will be granted the next year's scholarship.
Lin's exam answers get leaked to outsiders, but Bank ends up getting in trouble for it. Lin tries to find out who is the culprit and for what reasons. This could be an inside job.
Pat starts to notice that Grace is distancing herself from him. Lin decides to cheat the exams for the last time with a new answer-passing trick. However, this trick takes a turn when someone finds out about this exam-cheating operation.
Bank is very disappointed to know that Lin was the one who gave away the answers. The relationship between Pat and Grace also goes down the hill because Pat figures out why Grace is not the same anymore.
Lin becomes a tutor working with an agent named Music who suggests that Lin take STIC exams for other people. Lin then figures out another plan to earn more money, and asks Pat and Grace to join this STIC exam cheating mission together.
Bank's laundry shop gets broken into and completely trashed to pieces. Bank then decides to join Lin, Pat, and Grace in the STIC plan for money. Lin's parent suspects that Lin is up to something.
Lin and Bank are taking the STIC exam in Australia. With time closing in on them, this mission runs into a bigger obstacle which becomes a turning point for both Lin's and Bank's life.
Lin decides to move to Australia to live with her mother. However, this exam-cheating mission hasn't come to an end. Bank begs Lin to cheat on the national level entrance exams with him in order to earn over 10 million baht.
Lin unwillingly agrees to join and helps plan for this national level exam-cheating mission. This time is much riskier since it involves more than just the four of them, unlike what they have been doing before.
Their plan does not go as smoothly as expected and raises suspicion among other people. The tension and pressure build up to the point that it makes Bank choose a path that might cause him to fall out with the team.
