Sejeong finally shows up at school, and the narrator is all, "You're a liar! You're so sick of this friendship that you're going to have to end it." He's got something to tell her, too, and he's going to tell it straight to her. He tells her that everything she's heard from him so far is a lie. Did you really think that she was worried that she'd get hurt from telling the truth? And that's the reason why she stopped him from finding the key. If he found the key, he'd feel like "I'll die" if he read the letter. And if there's something inside Yonk's locker, she'll feel "like I'll be dead" if she reads it. She's not worried about Yonk getting hurt, though, because everything she said when they were together was "just a lie." She doesn't need the key anymore, she says, because all she said was just "prove what a nice