On March 15, the emotional thriller starring Kim Nam Joo and ASTRO’s Cha Eun Woo soared to its highest viewership ratings to date. The fifth episode of “Wonderful World” scored an average nationwide rating of 9.9 percent, marking a new personal record for the show. SBS’s “Flex x Cop”—which airs in the same time slot—stayed strong with a nationwide average of 8.3 percent.