Whether it’s a K-Drama or a C-Drama, it isn’t uncommon to see age gaps in romance series. One new show, however, has gone to extremes with its casting choices. Liu Xiaoqing (left) and Jin Jia (right) in “Splendid Tranquility” Liu Xiaoqing, a highly accomplished 75-year-old Chinese actress, has been cast as a teenage girl in…

