top 10 spots

I plan to visit Korea sometime in the fall or winter.
Can someone give me advice on their favorite places to visit?
Must sees?

Thanks,
Mixup

Get away from the big cities and hit the little islands that are out of the way. They are beautiful and relaxing and you can have entire beaches to yourself most of the time.

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i appreciate your help

Haeinsa, Soraksan, Gyeongju, Beomeosa, Bulguksa, Jeju-do, Ulleungdo, Jirisan, et al