(8th LD) Moon voices optimism before start of historic summit with Kim
(ATTN: CHANGES dateline; RECASTS headline, lead; UPDATES with remarks from leaders of two Koreas; Minor edits)
By Byun Duk-kun
SEOUL/PYONGYANG, Sept. 18 (Yonhap-Joint Press Corps) -- South Korean President Moon Jae-in voiced hope for progress in his