Can you guys translate this message for me. I used a translator and it's inaccurate. And I want to know who slipped the message inside the book. The grandfather, the girl (who posted the message) or another stranger? Or is the grandfather the stranger? And who owns the book? The girl, the stranger or the grandfather? It's about a story.
Please also give me a clear translation of everything, thank you.
1⃣️又体会到有同桌的喜悦感 2⃣️来自一个陌生人的温暖 （本来将书放在门口老爷爷那里保管下 拿回来的时候老爷爷在书里夹了张祝福纸条 感动至极 ）❤️