May 10 (Reuters) - South Korean Kim Hyung-sung fired a five-under-par 67 to grab the second-round lead at the Maekyung Open, leading an impressive showing by local golfers on Friday. Persistent drizzle at the Namseoul Country Club on the outskirts of Seoul could not dampen Kim's spirits as the local favourite mixed six birdies and a bogey for a one-shot lead at 10-under 134. "You can see it wasn't very good weather, so I am very happy with my score," said Kim, sounding confident that he had put behind him the shoulder injury that has plagued his performance in the last couple of years. ... More...