So I'm here to make a list about things that you should put in your kpop penpals! I hope you are able to get ideas from me!

book, flowers, and journal image
1. A letter: it's a penpal so of course you need letters! You can tell them what you thought about them or how good they really are. You can also add some questions to get to know each other.
stars and stickers image
2. Stickers: these would be really cute for the receiver. It would be nice as a cute little gift.
sticky bookmarks, cutestickers, and pretty paper goods image
3. Sticky notes: it's a helpful thing. They can use it on their studies or their daily tasks/reminder.
washi tape image
4. Washi tape samples: they can use it on to their notes. Also to spice up some stationeries that looks plain.
photocards, wonho, and monsta x image
5. Kpop photocards: you can send photocards based on their biases and just make them happy!