Chapter 1: The Return of a Shadow
After Isa's victory at the national competition, she is invited to an elite art school program. However, a mysterious new girl named Mira enrolls at their school and quickly rises in popularity—bringing Isa's past back to haunt her. Mira claims to know Isa's old secret and starts spreading rumors, wanting Suho for herself.
Chapter 2: Torn Between Hearts
Suho is cast in a school drama and his scenes with Mira cause tension. Isa begins doubting herself, but Jugyeong reminds her that she is no longer that insecure girl. Seo Joon faces pressure from his agency to stop dating Jugyeong, but he chooses love over fame. Together, the friends make a pact to never let outsiders tear them apart.
Chapter 3: The Betrayal Game
Mira leaks an edited video of Isa arguing with a teacher, making her look arrogant. Isa is called to the principal's office and nearly suspended, but Suho and Jugyeong launch a campaign proving it was doctored. Mira is exposed and suspended instead. Isa thanks her friends and realizes the power of truth and friendship.
Chapter 4: A Night Under the Stars
The school holds a masquerade ball. Suho and Isa arrive dressed as celestial beings, stunning everyone. Under the stars, Suho gives Isa a necklace with their initials. Meanwhile, Seo Joon surprises Jugyeong with a romantic song written for her. The couples dance the night away, unaware that a mysterious figure watches from the shadows...
Chapter 5: The Mask Falls
Mira's older sister, who turns out to be a disgraced ex-idol, begins targeting Isa for revenge. She believes Isa ruined Mira's chances. With the help of their friends, Isa and Suho set a trap and record her confession. The danger passes, and Suho promises Isa that no matter what comes next, he will never leave her side.