Got it! We’ll focus only on expanding the moment between Keith and Sana, as well as the chat with Jaesung, in this chapter. Here’s a more detailed, enriched version of those scenes:

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“Without me?! How dare you?? If something had happened to you…?” Sana’s voice rose with a mix of worry and exasperation. Her arms were crossed tightly over her chest, her foot tapping the floor in frustration. Her wide eyes were full of concern, though she tried to mask it behind her stern tone.

I stood there, my hands resting awkwardly at my sides, feeling the weight of her anger wash over me. It was understandable—Sana had always been protective, but right now, it was like she was holding back from shaking me for good measure. The tension in the room felt thick, and her voice, usually full of laughter and teasing, had become sharp, cutting into the silence between us.

“How could you do that without even telling me?” she continued, shaking her head as if she couldn’t believe I had kept her out of the loop. "We promised we’d look out for each other, didn’t we?"

I swallowed hard, my throat dry. “I didn’t want to worry you,” I mumbled, shifting uncomfortably from one foot to the other. It was a weak excuse, and I knew it, but I couldn't bring myself to say much more.

Sana let out a long, exasperated sigh, brushing a hand through her hair. “Well, congratulations, you’ve successfully worried me *now.*” She softened slightly, her shoulders sagging as her anger began to give way to something more tender. “You could’ve gotten hurt… or worse, Keith.”

The knot in my stomach tightened as her words sank in. The truth was, I hadn’t been thinking clearly for days. Ever since I started opening those letters, it felt like I was sinking into a pit of confusion and unresolved emotions. Each piece of paper seemed to pull me further from reality, closer to a past I couldn’t fully grasp.

After a few more moments of strained silence, Sana’s expression softened further. She took a deep breath, crossing the room in a few strides and standing in front of me. Gently, she placed her hand on my arm, her eyes searching my face.

“So… do you have to remember him?” she asked gently, her voice dropping to a quiet, almost tender tone. Her brow furrowed as she looked at me with a kind of sympathy that made my chest ache.

I bit my lip, feeling a wave of confusion surge inside me. I turned my gaze toward the window, focusing on the handle, as if the metal could somehow ground me in this moment. The sunlight outside was warm, golden, filtering through the glass and casting soft shadows on the floor, but all I felt was this strange emptiness, this gnawing sense that I had no idea who I was supposed to be. Or who *he* was supposed to be.

“I don’t know,” I muttered, my voice barely audible. “I really don’t know, Sana. Everything’s so… unclear.”

“Sounds like someone who promised you not only his heart but also his life,” she murmured thoughtfully, tilting her head as she spoke. There was a softness in her voice that made me look up at her again, meeting her gaze. “I think you’ll reach him too. But maybe not all at once. It’s a lot to take in.”

She sat down on the edge of my bed, patting the space beside her in a wordless invitation for me to sit next to her. When I hesitated, she gave me a gentle smile, warm and understanding, and I finally moved to sit beside her. Her hand slipped into mine, her palm warm and soft, her thumb tracing soothing circles on the back of my hand.

“I need a break,” I whispered, almost ashamed of admitting it out loud. “If I keep opening letter after letter, and each time find out such heavy information, I don’t think I’ll survive.” My voice wavered as I said the words, and I realized just how fragile I felt at that moment.

Sana gave my hand a reassuring squeeze, her fingers tightening around mine. “I think that’s a really good idea,” she said, her voice gentle but firm. “Let’s leave the letters for a while; what do you say?” She smiled then, a real one, her eyes brightening as she spread her arms in a playful gesture. “Maybe we could focus on something else—like making sure you don’t fall apart completely?”

Her attempt at lightening the mood worked, and I couldn’t help but smile, if only for a second. “Yeah,” I murmured, nodding. “Yeah, I think that’s exactly what I need.”

For a few moments, we sat in comfortable silence, Sana’s presence anchoring me. She always knew how to bring me back, how to pull me out of the darkest parts of my mind. It had always been like that—her laughter, her voice, her little gestures of kindness. Even now, just sitting next to her made the burden on my chest feel lighter.

Finally, she stood up, smoothing out the wrinkles in her skirt and giving me an encouraging smile. “I should probably head home now. Don’t want to miss my bus.”

I nodded, feeling a strange pang of sadness as she prepared to leave. Part of me didn’t want her to go. I wasn’t sure I was ready to be alone again. But I knew I couldn’t lean on her forever.

“Thanks, Sana,” I said softly, standing up and giving her a quick, tight hug. “For everything.”

“Anytime, Keith,” she whispered, hugging me back. She pulled away, giving me one last look of concern before walking toward the door. “Just… take care of yourself, okay? I’m just a message away if you need me.”

“I will,” I promised, watching her leave.

As the door clicked shut behind her, the weight of solitude settled around me again, though this time, it felt different. The quiet was still heavy, but I wasn’t drowning in it like before. I took a deep breath, trying to hold onto the sense of calm Sana had left behind.

But then, my phone buzzed, interrupting the silence. I glanced at the screen, seeing an unfamiliar number flash across it. A new message.

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I stared at the screen, my mind racing to catch up. Jaesung? The guy from the park? The memory of that day was blurry, but I vaguely remembered the incident—his apologetic smile, the awkwardness of our brief interaction, and then… him helping me home. My heart thudded in my chest, a strange mix of embarrassment and curiosity flooding my system.

I hesitated, my fingers hovering over the keyboard before I added another message.

His reply came quickly.

I groaned inwardly, shaking my head as I read his words.

I sighed, feeling a small smile tug at my lips despite myself.

For a few moments, there was no reply, and I found myself wondering if I’d said too much. But then, my phone buzzed again.

I frowned at the message, feeling a mixture of disbelief and amusement. Popular? Me? I let out a quiet laugh as I typed my response.

There was a pause before his next message came through, and I could almost imagine him grinning on the other end of the conversation.

My eyes widened at that. Sana… again? I groaned out loud this time, shaking my head in disbelief.

I hesitated, a part of me feeling reluctant to accept help from someone I barely knew. But then again, what did I have to lose?

I chuckled at that, feeling a little more at ease.

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I stared at the screen for a while after the chat ended, feeling a strange sense of anticipation. Something about Jaesung’s easygoing nature made me feel like maybe, just maybe, things were starting to change for the better. And for the first time in days, I felt… hopeful.

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This version dives deeper into Keith’s internal thoughts, emotions, and his evolving relationship with both Sana and Jaesung. Expanding the introspection and dialogue helps to flesh out the characters and adds more layers to the story while staying focused on this particular chapter. Let me know if you'd like to develop any sections further!