This is the district where rich people live in Korean drama, and there are lots of art galleries around here. If you just want to go to Gana Art Centre, take bus 171, 1020 (exit 3 of Gyeongbukgong Station), and get off at Lotte Apartment Station 롯데아파트 정류장, cross the road and walk up for about 320m, Gana Art Centre will be on your right hand side. When I went there a couple of years ago, there was a restaurant which appeared in Korean drama- The Greatest Love, but it was expensive and the food was no good.
Pyeongchangdong is at the base of Bukhanshan. so it formed part of the path around the mountain, and lot of houses in Korean drama, for example, houses of the guy in Nine and the Greatest Love, I heard Heirs was also filmed around here. A restaurant and area around that restaurant was used in the filming of Secret Garden too. And there is also an alley walk you can do, if you follow that alley walk, you can go through most of the places used in these drama. Please get off earlier at Seoul Art High School/Pyeongchangdong Community Centre Station서울예술고등학교.평창동주민센터. The Alley Walk map is below.
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