We investigated South Korean workers' reflections on career chance events in terms of types of chance occurrences and factors that influence how these are reacted to. A critical incident technique was used to collect data from 85 participants using an open-ended questionnaire. Various types of events that happened unexpectedly were identified through a two-dimensional framework: whether an event was relationship based or experienced based, and whether it occurred in personal areas or work areas. Influencing factors that affected the participants' reactions were also categorized using a two-dimensional framework: internal or external, and facilitating or discouraging dimensions.