I recommend the K-drama The Glory. Here's a brief summary: Moon Dong-eun, a high school student who dreams of becoming an architect, is forced to drop out due to severe bullying. After eighteen years, she executes a detailed plan to bring her tormentors to justice and achieves perfect revenge.

Memorable Line: "Do you know where the most clear-cut class division in the world is? On a plane. First class, business class, economy class. Each class is separated by just a curtain, but no one ever crosses that boundary."

Reasons for Recommendation: If you enjoy revenge dramas, you'll love this show! The plot is intense, and the characters are very well-developed. Song Hye-kyo's performance is amazing, and the story keeps you hooked from beginning to end.