This study examines the relationship between non-regular young workers' perception of the possibility of conversion to regular employment and helping behavior. Simultaneously, it focuses on the roles of attitudes toward the organization and social relationships with regular employee colleagues as positive mechanisms that can explain this relationship. Drawing on social identity theory, it was predicted that non-regular employees, who are in a relatively lower status position compared to regular employees, would be more likely to adopt desirable behavioral strategies within the organization as their perception of the possibility of transitioning to regular employment increases. Accordingly, this study considered non-regular employees' perception of the possibility of conversion to regular employment as an important antecedent of helping behavior. Furthermore, focusing on social relationships and attitudes toward the organization as positive effects of non-regular employees' perception of conversion possibility, the mediating roles of non-regular employees' social relationships with regular employees and affective organizational commitment were hypothesized. An analysis of 250 young non-regular workers employed as contract workers or interns with tenures of less than two years confirmed that the perception of the possibility of conversion to regular employment had a positive relationship with helping behavior, and as expected, social relationships with regular employees and organizational commitment were important mediating variables explaining this relationship. The results of this study hold theoretical significance in that they revealed that non-regular employees' perception of the possibility of conversion to regular employment affects perceptions and attitudes toward colleagues and the organization, ultimately facilitating prosocial behavior. Simultaneously, the study has practical significance in that it demonstrated the organizational effectiveness of young workers' perception of the possibility of conversion to regular employment, reflecting the recent organizational and societal interest in pathways from non-regular to regular employment.