12 possible quests, so you have to type in the general chat a number between 1 and 12.
It is often 4 or 7.
EDIT: it seems that it is linked to your character astrological sign.
EDIT 2, thanks to aceofaces20:
4: Boat, Key, Camel, Treant Owl
5: Elephant, Sealing Stone, Wagon
6: Hammer, Shield, Goblin
7: Black Dragon
8: Giant

The answer is how many stars your character's star sign has.

4: Boat, Key, Camel, Treant Owl
5: Elephant, Sealing Stone, Wagon
6: Hammer, Shield, Goblin
7: Black Dragon
8: Giant

เควสนี้สำรวจโต๊ะของทูริคและบันทึกการแลกเปลี่ยนสีจาง (อยู่ด้านหลัง NPC)
เสร็จแล้วพิมพ์ตัวเลขลงในช่องchat
(ตัวเลขจะอยู่ระหว่าง 1-12)

แล้วคุยกับ บันทึกการแลกเปลี่ยนสีจาง อีกครั้งแล้วเลือก ผนึกถูกคลายออก

La respuesta es cuántas estrellas tiene el signo zodiacal de tu personaje.

4: Barco, Llave, Camello, Búho Treant
5: Elefante, Piedra Selladora , Carreta
6: Martillo, Escudo, Goblin
7: Dragón Negro
8: Gigante

在一般聊天視窗
依據你遊戲中的星座
輸入4或5,6,7,8

01:39 On the Last Page of the Old Exchange Journal

https://www.youtube.com/watch?v=uyt_NvtJb1E

Bu görevde yapmaniz gereken sohbet satırını açıp 1 2 3 4 5 şeklinde rakam yazmanız. Bu rakamların her biri aslinda sizin burcunuzla alakali. Daha sonra tekrar gönlüğü okuyunuz.

Can someone help me? No matter how many numbers I write, they don't work. My tower is the key. I play on PS4