(LEAD) S. Korea, China still apart over N. Korea

(ATTN: CHANGES dateline; ADDS Yun's speech in last 5 paras) SEOUL/MUNICH, Feb. 12 (Yonhap) -- South Korean Foreign Minister Yun Byung-se urged China to play a "responsible" role in the push for a "terminating" U.N. resolution against North Korea. In