(LEAD) Kim Whan-ki's painting breaks S. Korean auction record at 6.55 bln won
(ATTN: FIXES date; ADDS more details in paras 2, 4-7) SEOUL, April 12 (Yonhap) -- A painting by Korean abstract artist Kim Whan-ki has been sold for 6.55 billion won (US$5.74 million) on Wednesday, making it the most expensive South Korean artwork eve