This article aims to reveal the boundary between humor and murye/bulson. Murye/bulson and humor are one of the inferences aspects of conversational implicature. Mechanisms to consider murye/bulson as humor present as follows: multiple indirectness and virtual world in the contexts understood to be untrue, existences sympathized within familiarity, conversions of implicature, setting, relation and area. These mechanisms permit to deviate from individual responsibility and offset murye/bulson. On the other hand, according to bulson implicature, there are situational·relational conditions that humor is not allowed any more as humor: Korea's sensitive topics cling to previous negative situations·emotions, invasion of privacy against expected values, gender inequality, class distinction, neglecting the weak, disparagement of appearance violating the limit of emotions and disregarding status.