today I figured out why korean TV series are much more popular than Chinese home-made ones. Korean TVs feel so real and very close to daily life, while chinese ones often aim at some high moral theme. To give a piece of dialgue as example: son is later for work, and his boss called him. Son said that he is leaving home. His father blames him for being stiff and said that son should have said that he is on the way instead of leaving home. Very homely and vivid conversation that can easily arouse sympathetic response of even chinese audience.
This remind me of Taiwanese talk show. The reason that the taiwanese Xiao S is popular is also due to her straightness. She talks about her personal expierence and feeling, such as her feeling of pregnancy.
Another reason for the popularity of Korean TV series is the cultural recognition and sympathetic response of old Chinese values.