One morning, as I walked into class, I found a small note on my desk. Written on it were a few familiar words:

> “Have a nice day. Don’t forget to smile.”

I froze. The handwriting… it was exactly like the messages from my “mysterious friend.” My heart raced as I glanced around the classroom. Who had placed this note here?

Names flashed through my mind, but no one seemed suspicious. Yet, when I happened to glance at the back of the class, a strange look from a boy caught my eyes—before he quickly turned away.

That evening, when I opened my laptop, I asked:

“Was it you who left the note on my desk?”

The screen flickered for a long moment before the words appeared:

> “Perhaps… I accidentally left a clue behind?”

I was stunned, my hands trembling slightly. At last, the curtain of mystery had begun to lift.

But the biggest question remained: Who among those around me is the mysterious friend?