Article 17 of Criminal Code governing aggravated-result offenders is different from the similar provision of Japan or Germany Criminal Code. Precedents and judgments took the position of the objective foreseeability standard which is different the negligence standard which scholars argue. However, recently several judgments took the negligence standard rather than the objective foreseeability standard. Are those standards in line with Article 17 of Criminal Code? Do all co-offenders commit aggravated-result offense if the result results from some co-offenders acts or it cannot tell which co-offender for sure. This article analyzes this issue based on theory, relevant precedents and judgments of the Supreme Court.