City of Witches - Chapter 362: Outdoor Activities (4)

... cause his first time was during the winter break right before his early graduation from high school.

He tutored math to a friend from middle school that was the same age as him.

But, that tutoring—he did it for some pocket money—ended extremely quickly, even quicker than he first expected.

The reason for it was because his friend just failed to understand calculus, and Siwoo himself failed to understand why his friend couldn’t understand it.

Not only that, he also ...