(LEAD) (Olympics) S. Korea's Lee Sang-hwa wins silver in women's 500m speed skating
(ATTN: UPDATES with comments, details from 4th para; ADDS photo)By Kim Boram and Kang Yoon-seung
GANGNEUNG, South Korea, Feb. 18 (Yonhap) -- South Korea's speed skating sprinter Lee Sang-hwa, the defending Olympic champion, won silver in the women's