Seoul big textbook:
Qingxi big textbook:
There is also a workbook that supports synchronization.
Seoul National University:
Qingxi University:
You don't have to buy grammar books separately in primary school.
If you need to buy a dictionary, it is recommended to buy the Modern Korean-Chinese-Korean Dictionary published by Foreign Language Teaching and Research Press.
All the above books can be bought in the online bookstore.
The introduction of Korean by FLTRP and the standard Korean of Peking University are out of date.
Korean courses at Yonsei University are difficult to get started.