A Letter to Koyin is a Side Adventure in The Legend of Zelda: Tears of the Kingdom (TotK) that is found in Hateno Village. Read on to learn how to unlock A Letter to Koyin, its location and rewards, as well as how to complete this Side Adventure!

How to Unlock A Letter to Koyin

Talk to Koyin in Hateno Village

Speak with Koyin in Hateno Village. You can find her sulking beside a huge lake.

Part of Hateno Side Adventure Arc

A Letter to Koyin is a part of Hateno Village Side Adventure Arc. You can start and unlock all the Side Adventures in any order, except for The Mayoral Election!
Hateno Village Side Adventures

A Letter to Koyin Location and Rewards

East Necluda - Hateno Village

The exact coordinates for this quest on the map are 3630, -2045, 0175.

East Necluda Region Map

Rewards

How to Complete A Letter to Koyin

How to Complete A Letter to Koyin
Locate the Message in Bottle Create a Makeshift Raft Use the Raft to Get Closer to the Bottle Grab the Bottle Return to Koyin Follow Koyin to Her House

Locate the Message in Bottle

Inspect the middle of the lake to find the floating message bottle.

Create a Makeshift Raft

Getting the message bottle can be tricky as it is located quite far into the lake. Use the resources around you to find a way to reach the message bottle, like creating a raft.

Use the Raft to Get Closer to the Bottle

Use Ultrahand to lift the raft and position it as close to the message bottle as possible.

Grab the Bottle

Climb onto the raft you positioned and grab the message bottle out of the lake.

Return to Koyin

Go to back to Koyin with the message bottle. After gaining clarity through the message left by her grandfather, she will invite you to visit her house.

Follow Koyin to Her House

Speak with Koyin inside her house to receive your reward and complete the side adventure. You will then be able to unlock a trading relationship with Koyin.

Trade Fresh Milk for Hateno Cheese

Upon completing the side adventure, Koyin will be able to completely open up her Hateno Cheese Shop. She will open a trading relationship with you swapping fresh milk for Hateno Cheese.

How to Get Fresh Milk

The Legend of Zelda: Tears of the Kingdom Related Guides

List of All Walkthroughs

All Quest Types
Main Quests	Side Quests	Side Adventures

List of All Side Adventures

Side Adventures by Story Arc	All Side Adventures
Robbie Side Adventures	1. Hateno Village Research Lab 2. Filling Out the Compendium 3. Presenting: The Travel Medallion 4. Presenting: Hero's Path Mode 5. Presenting: Sensor +
Hateno Side Adventures	6. A Letter to Koyin 7. A New Signature Food 8. Reede's Secret 9. Team Cece or Team Reede 10. Cece's Secret 11. The Mayoral Election
Lurelin Side Adventures	12. Ruffian-Infested Village 13. Lurelin Village Restoration Project
Lucky Clover Gazette Side Adventures	14. Potential Princess Sightings 15. The Beckoning Woman 16. Gourmets Gone Missing 17. The Beast and the Princess 18. Zelda's Golden Horse 19. White Goats Gone Missing 20. For Our Princess 21. The All-Clucking Cucco 22. The Missing Farming Tools 23. Princess Zelda Kidnapped 24. An Eerie Voice 25. The Blocked Well 26. Serenade to a Great Fairy
Great Fairy Side Adventures	27. The Hornist's Dramatic Escape 28. Serenade to Mija 29. The Flute Player's Plan 30. Serenade to Kaysa 31. Honey, Bee Mine 32. Serenade to Cotera
Monster-Control Crew Side Adventures	33. Bring Peace to Hyrule Field 34. Bring Peace to Necluda 35. Bring Peace to Eldin 36. Bring Peace to Akkala 37. Bring Peace to Faron 38. Bring Peace to Hebra
Lookout Landing Side Adventures	39. Hestu's Concern 40. A Deal With the Statue 41. Who Goes There?
Koltin Side Adventures	42. The Hunt for Bubbul Gems 43. The Search for Koltin
Tarrey Town Side Adventures	44. Mattison's Independence 45-49. A Monstrous Collection
Thyphlo Ruins Side Adventures	50. Investigate the Thyphlo Ruins 51. The Owl Protected by Dragons 52. The Corridor Between Two Dragons 53. The Six Dragons 54. The Long Dragon
Sky and Depths Side Adventures	55. Legend of the Great Sky Island 56. Messages from an Ancient Era 57. A Call from the Depths
Yiga Side Adventures	58. Infiltrating the Yiga Clan 59. The Yiga Clan Exam 60. Master Kohga of the Yiga Clan