Both Korea and Georgia would fit the bill here, except maybe the midsummer months, which are pretty hot & sweaty in Seoul. You may be able to take the edge off by living at higher altitude or by the sea.
Seoul is great but it has huge variatuon in weather. It's like the east coast of the US where you get a nice month and a half of spring and a nice month and a half of fall and everything else is far to one extreme