Ongsa falls in love at first sight with the more popular Sun. However, she decides to approach her under the pseudonym "Earth". Will Ongsa reveal herself to Sun?
Ongsa starts at a new school and comes face to face with her online crush, Sun. After an awkward start, Sun comes to her rescue - not knowing that Ongsa and the online account "Earth" she's been chatting with are the same person.
Ongsa and Sun grow closer both online and in school. Sun continues to believe that "Earth" is a guy, while Ongsa becomes more torn between revealing the truth and losing Sun's interest.
Ongsa struggles to keep up the deception as Sun grows fonder of "Earth." Meanwhile, Aylin, Ongsa's cousin, adjusts to her new surroundings and begins an unlikely bond with Luna.
Ongsa and Sun's friendship deepens in real life. Ongsa finds herself falling harder for Sun but grows increasingly anxious about what will happen when the truth comes out.
Sun invites Ongsa and her friends to her birthday party. Ongsa wonders what to gift her, while Tinh and Aylin urge her to come clean before she hurts Sun. Ongsa is torn between honesty and fear of losing Sun.
The truth about Earth finally comes to light. Sun is hurt by the deception and distance grows between them, leaving Ongsa heartbroken and unsure how to make things right.
Ongsa and Sun navigate the aftermath of the revelation. Slowly, they begin to rebuild their connection - this time on honest ground - as feelings between them continue to grow stronger.
Ongsa and Sun take steps to define their relationship, while the rest of the friend group deals with their own personal milestones as graduation approaches.