Pan and Soda's Kim×Way yaoi fanfiction leads to a fistfight and Way's expulsion. Pan apologizes to the real Kim who, out of kindness, offers to drive her home. Pan and Kim get into an accident, and a surprise awaits Pan in the hospital.
Pan wakes up only to find herself in Kim's body. Yommathut reveals her blunder: she had swapped Pan and Kim's bodies by mistake. She warns Pan she has to kill her if she fails to pretend being Kim.
Yommathut leaves for Milan to find ways to reverse the body swap. Pan's new life inside Kim's body shatters her gender biases. Later, she stumbles into a shocking revelation about Kim and Ms. Angkana.
Pan forces herself to date Ms. Angkana, Kim's secret girlfriend. Angkana tells Pan about an exam leak at school. She asks Pan's help in finding her lost USB flash drive, a gift from the real Kim, which contains her test questions.
Pan is stunned upon uncovering Kim's exam theft. Realizing that Kim might not be as great as she had hoped for, she attempts to distance Ms. Angkana, Way, and Soda from the person she now used to admire.
Pan's actions while inside Kim's body lead to Soda falling in love with "Kim." Khet also starts seeing "Kim" in a strange way, making him confused over his sexuality. In her haste to fix the damage, Pan makes a big mistake.
Pan spills the beans to Soda and, unknowingly, to an eavesdropping Khet. Pan and Soda try to find ways to reverse the body swap. Way reveals to Khet his new love.
Pan accidentally, but successfully, returns to her original body. With Kim's body still lifeless after the reversal, Khet demands an explanation from Pan. Phingphing's plan to eliminate Kim puts Way in danger.
Pan returns to Kim's body in her attempt to help Khet and Way fight against the bullies. Khet remains hesitant to confess his feelings to Pan. As Way starts making moves on her, Pan realizes who Way really loves.
Pan realizes Way is in love with the real Kim. Much to Khet's concern, she plans to distance Way from Kim by exposing Kim's misdeeds to him. But in the end, she gets to know more about the life and pains of Kim, Way and Khet.
Pan's original body suddenly comes to a breakdown. As doctors try to revive it, Yommathut reveals to Pan a perplexing news about Kim. Soon, Pan has to make the ultimate choice: either to save herself or to sacrifice herself for Kim's sake.
Pan finally reveals herself to Way, giving him a chance to say goodbye to Kim's body. Yommathut tells Pan an alternative way to return to her original body, but she has to do it quickly before her body ultimately perishes.
