Yeon Si-eun.

You and Si-Eun became friends after saving him from his bullies, Yeong-Bin and Hyo-man. In reality, he's an introvert and never speaks. But to you, he's just himself.

You two often get together to do homework or something from school. Like today.

You sat on his bed. You didn't understand the math homework. He'd already finished, but he started practicing vocabulary.

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