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The new Niyomsil School principal unveils plans to cut clubs that aren't performing to her standards and Gun's music club tops her list. Gun runs for student body president as with it comes the power of choosing which clubs are pulled, but he's beaten by the principal's son Tinn. Gun's next course of action is to try to raise the club's standing by performing well in competitions, but he's fighting time and Tinn's seeming determination to see them fail.

Because should Gun win the student body president election he'll be forced to quit the music club, Tinn is forced to run against his crush. However, once he's saved Gun's club from imminent doom, his mother reclaims all their instruments. Tinn goes to great lengths to reequip the club without letting on that he's the one behind the efforts.

Following Tinn's vow to help their band, Gun approaches Tinn to get help persuading their principal to sign their Hot Wave application. They manage to persuade her, but she adds that she will only sign it if they pass all their mid-terms. Tinn then seizes the chance to tutor Gun privately, dense as he is.

Skilled guitarist Sound enrolls at Niyomsil Sueksa and Chinzhilla want him for their band. Sound also happens to be Tinn's old rival and Sound joins the band in order to fuel the rivalry between the student council and the music club. However, when Sound arrives, his criticisms of Gun's leadership prompt Gun's resignation.

As the students are contemplating their futures and his mother is struggling to keep her business afloat, Gun begins to think he should move on from the club and from music overall. Seeing Gun in such low spirits, Tinn makes it his mission to uplift him. Meanwhile, Por and Thiu begin studying with the same tutor and Win takes part in a rap battle emceed by Sound.

Chinzhilla prepares their audition for the Hot Wave Music Festival. To show their very best, the group decides to produce a music video and enlists the help of Thiw as their director.

The music club's no dating policy comes into question when Yo meets Nook on Tinder but uses Tinn's photos instead of his own, out of fear of the club rules.

The Chinzhilla members get permission to stay overnight at the school to continue their rehearsals. However, challenges to their rehearsal continue to emerge.

Chinzhilla, accompanied by Tinn and Thiw, take a trip to the beach to find inspiration for their music. However, when they arrive, Yak has other plans for them in the form of an intense rehearsal schedule.

While Tinn is helping Gun's mother, she experiences a sudden health emergency. Gim urges Tinn not to tell Gun about what happened. Meanwhile, Chinzhilla prepares for the final round of Hot Wave.

With Tinn, the music club takes a trip to a temple. On the way there, they encounter a closed off road and are forced to walk with Por injured. Smarting from their Hot Wave loss, the heat and the exertion creates tension among the club members. Principal Photjanee is fixated on learning the truth behind Tinn's closeness with Gun.

After resolving to keep their relationship private, Gun and Tinn are outed when pictures of them looking intimate circulate on social media.