I'm gonna answer some questions that people have asked me about the characters.
1. Are Su and Kani in the same grade?
They are! They're in the same class as well.
2. How tall are Su and Kani?
Su is 1,62m (5'4), so she's average. Kani is very short for his age (1,54m; 5'1), so Su seems extremely tall next to him.
(Perfect example lmao)
3. What exactly happened to his parents?
Well, they died of a drug overdose. They faced many struggles Kani didn't know about. He blames himself for their death, but it's obvious that it's not his fault.