A possible summary is:
Rose is a space nerd who loves her grandfather's planetarium. She meets Henry, a rich and rude businessman who wants to demolish it. She agrees to work as his assistant to save the planetarium, but falls in love with his half-brother Noa, who plays the piano. Henry takes her to Korea to meet his grandmother, but Noa follows them and reveals his plan to destroy the planetarium. Henry changes his mind and gives it back to Rose, along with a letter confessing his love. Rose flies to Korea again and tells Henry she loves him too.
Here are some key facts extracted from the text:
1. The narrator's name is Rose and she grew up with her grandfather who worked at a Planetarium.
2. Rose was the brightest in her class and graduated a year early.
3. Rose climbed a tree to protest against the demolition of the Planetarium by Henry Hampton, a rich businessman.
4. Henry offered Rose to work as his assistant for $4,000 a day and she accepted to save the Planetarium.
5. Rose met Henry's half-brother Noa, who played the piano and was friendly to her.
6. Rose and Noa started dating, but Henry was jealous and rude to her.
7. Rose won a quiz competition and a cash prize that could pay for her college.
8. Henry took Rose to Korea to meet his grandmother, who was his only family.
9. Noa revealed that he had signed a deal to demolish the Planetarium and Henry slapped him.
10. Henry returned the Planetarium and a million dollars to Rose anonymously and she flew to Korea to confess her love for him.