With the 128 subjects of this research, Boryokudan offenders were noticeable (52.3%), but there were not many offenders who were raised under bad living conditions. Many of the cases were such cases where a heinous offense was committed by passion/strong emotion at the time of offense without any understandable reasons to kill the victim, or cases where homicide was committed by the offender in order to solve his own problem by force under circumstances where he was unsatisfied or had troubles with the victim.
  As a result of observing repeat homicide offenders in this research, six traits are identified as mentioned below.
1. In many cases, there were similarities in the motive or cause, modus operandi, relationship with victim, etc. when comparing the first-time cases with the repeat cases;
2. The most common motive or cause was “anger/strong emotion”. Many repeat homicide offenders were unable to control their emotions when committing the homicide;
3. Most repeat homicide offenders repeated homicide with several criminal motives or causes;
4. A strong relationship between heinous or violent cases and Boryokudan was discovered;
5. Many offenders committed homicide under influence of alcohol;
6. Many repeat homicide offenders had relationship with limited range of people and were leading single and unstable lives.