They were each other's first love, but greed for money and power led to their end. And after a tragic car accident, Naeun is left without her memories. Years later, they meet again...

Son Naeun

In the first chapter, student, age 16. In later chapters, she's a budding architect, age 22. 

Lee Taemin

In the first chapter, age 18. In later chapters, he's the head engineer of a design firm, age 24. 

Jang Eunji

Naeun's best-friend. In the first chapter, age 18, in later chapters, age 24. 

Kim Jongin

Taemin's business partner, head of finance, age 25.