This case study analyzed the success factors of quick stabilization of LG Innotek’s Vietnamese subsidiary, a global electronic parts company, particularly focusing on human resource management (HRM) and employee relations (ER). The sampled company entered Vietnam in 2016 to enhance cost competitiveness and secure a stable global production base. It initially experienced unexpected trials and errors, but overcame them and succeeded in mass production, and has now grown into a key overseas manufacturing center of LG Innotek. In addition to external growth, it is creating a top-tier employment brand locally with a positive image, that is, a young company with a horizontal culture that grows rapidly. This study analyzed two main factors for quick stabilization in terms of HRM/ER. First, the establishment of a positive work environment considering the Vietnam’s local context, and second, the transfer of and localization of PRIDE activities which are being carried out at the headquarters in Korea. Existing studies in Vietnam tend to pay attention to general phenomena because most of them are survey-based quantitative studies that focus on a certain point in time or comprehensively deal with overall success factors. In this respect, this study will provide more specific and practical HRM/ER implications for Korean companies doing business in Vietnam, in particular for the ones which run manufacturing facilities there. In addition, LG Innotek’s HRM/ER strategy, which is highlighted in this study, will contribute to the development of propositions that deserve further analysis in the context of Korean companies entering Vietnam in the future.