(Clockwise from top) Top K-dramas 'Crash Landing on You,' 'The World of the Married' and 'Itaewon Class'  (tvN / JTBC)  “Crash Landing on You” of tvN and “The World of the Married” and “Itaewon Class” of JTBC became the overall most talked about Korean dramas in the first half of the...