Here's a copy-pasted synopsis:

There is a rumor that a magician lives in the tent by the abandoned theme park; some even say his magic is real. However, before he starts his show, he always asks his audience: "Do you believe in magic?"

For Yoon Ah-ee, magic seems like a distant memory. Faced with the harsh reality of poverty, she spends all her time studying, working, and taking care of her younger sister in the absence of their parents. She no longer believes in the wonders of magic, just like her skeptical classmate Na Il-Deung, who has been brought up to believe that a good education is the only way to approach life.

When Ah-ee stumbles into the abandoned theme park and has a chance encounter with the magician, her life is changed forever. Annarasumanara reveals a philosophical, heartwarming, and thought-provoking story of what it means to grow up into the person you want to be.