North Korean leader Kim Jong-il's first son Kim Jong-nam survived an assassination attempt, according to South Korean news network KBS Monday.KBS reported that the attempt was spearheaded by aides of the North's heir apparent Kim Jeong-un, the 26-year-old third son of Kim who was recently designated to succeed the North's head.However, the plot that was tried out without the knowledge of Kim Jong-il failed as China foiled the attempt. KBS said Kim Jong-nam had maintained a close relationship with senior officials of China.KBS said Kim Jong-nam could save his life with the help of China and added he might seek asylum in the world's most populous country.