Hyehwa Station Line 4 Exit 4. See 'Haagen Daaz', then make a left turn. Go straight for about 200m (should see Fantaseum--a theater, as well as an Omuto Tomato, a Tous Les Jours, a Misha beauty shop, an ETude beauty shop, an ARTBOX). Across a small street, there's a shop that sells bags. Across a bigger street with a crosswalk, there's a Burger King. Do not cross the crosswalk!
Before the crosswalk, turn left onto the side road next to the Family Mart. Then turn right. When you see a parking lot, turn left (away from the parking lot). You should see a sign 'Golden Pond Guesthouse.'