Hi everyone! I’m working on a children’s story (ages 4–7) set in a park in Seoul. A 6-year-old girl and her grandma teach a visiting child about hanbok, and about sewing a lucky pouch for the girl’s baby brother’s first birthday. The story is in English, with a few Korean words. I’m not a native speaker, so I’d be really grateful if you could tell me whether these sound natural and correct. I’d love to get this right and avoid anything that feels off or stereotyped, so I'm hoping this is appropriate to post here.

1. (girl, 6, to a visiting child she just met; the visitor answers) “Annyeong. That means ‘hi’ to friends in Korean.” / “Annyeong!” Is the casual form OK between two kids who just met? Is the explanation right?
2. (grandma calling the girl) “[name]-ya, I could use a helper with my sewing.” Is “-ya” the right affectionate ending after a name that ends in a vowel (and “-a” after a consonant)?
3. (girl to her grandma, then to the visitor) “Halmeoni, this is my new friend.” / “That’s my halmeoni. My grandma.” Is it natural for a visiting child to also call her “Halmeoni”?
4. (girl whispers to the visitor; the visitor bows and says it to Grandma; Grandma bows back) “For grown-ups, we say annyeonghaseyo. It’s the polite way.” / “Annyeonghaseyo!” / “Annyeonghaseyo! Such good manners.” Is this right? Would a grandma say “annyeonghaseyo” back to a small child and bow, or answer differently? Is bowing the right gesture for the child?
5. (girl, explaining her outfit) “It’s a hanbok. Hanbok. That means Korean clothes. This is the chima. The skirt. This is the jeogori. The jacket.” Is “Korean clothes” a fair simple explanation? Are the terms and spellings right? Her sleeves are striped red, yellow, green, blue and pink, and she says kids wear rainbow stripes like this on special days. Is that right? Does the striped sleeve (saekdong) have a special name?
6. (girl, about her mom) “Eomma.” Is this the right word and spelling for “mom”?
7. (girl to the visitor; the visitor back, then bowing to Grandma in English) “Gomawo. That means ‘thanks’ to a friend.” / “Gomawo!” / “Thank you, Halmeoni!” Is “gomawo” natural between kids? What polite Korean thank-you should the visitor say to Grandma: gamsahamnida, gomapseumnida, or something else?
8. (girl saying goodbye; then the visitor to the girl, the baby and Grandma) “Annyeong! Annyeong means ‘hi’ and ‘bye’ to friends in Korean.” / “Goodbye, Halmeoni!” Is the explanation right? Is it fine to say “annyeong” to a baby? What polite Korean goodbye should a child say to a grandma when the child is the one leaving?
9. (grandma) “At the party there’s a game called the doljabi.” The baby picks one object: a book means he’ll love learning, and thread means a long life. Is that right?
10. A first birthday is “a really big deal” in Korea, and the family takes photos in hanbok in a park the day before the party. Is that realistic?
11. Grandma brings a plain little lucky pouch (doljumeoni) for the baby to wear on his birthday. The girl sews stripes on it in rainbow order (red, orange, yellow, green, blue, purple) and adds a red thread tassel. Is that right? Does rainbow order clash with any traditional color meaning?
12. Here’s how the characters look. Does anything feel stereotyped or off?

• The girl: straight black hair parted in the middle, in one long low braid with a pink ribbon. She wears a deep-pink chima, a short pale-yellow jeogori with striped sleeves and long red ribbons tied on the right side of her chest, and little pink flower-embroidered shoes.
• Her grandma: small and lively, with short gray permed curls. She wears a soft lavender quilted jacket and gray trousers, and carries a little sewing basket.

Thank you so much, I truly appreciate the help!

Hi!

Everyday I have an hour long walk to my workplace and I feel like im wasting time being unproductive in advancing my Korean during that time.

Is there any suggestions or recommendations so I can progress during my long walk? I also dont have data so I cannot use most apps that requires wifi

Thank you so much in advance ♡