To investigate individuals' implicit beliefs--underlying assumptions about the self and the world--the present study validated the Korean version of the implicit theory of work scale for undergraduates, exploring its role in career-related behaviors and affect. The study used two different samples of 560 and 340 undergraduates who participated in an online survey. The validity evidence of the scale was as follows: (1) The content of domains and items was appropriate for measuring implicit belief in work among Korean undergraduates; (2) a two-factor model with destiny belief and growth belief was confirmed by factor analysis; and (3) higher levels of destiny belief were related to higher levels of entity belief in intelligence and lower levels of incremental belief in intelligence, flexibility in career belief, and curiosity in career adaptability, whereas higher levels of growth belief showed the opposite patterns. The validated scale also showed the distinctive role of destiny and growth belief.