A new small redbean cultivar, ‘Hongjin’, was developed by an artificial cross between ‘SA9206-2B-6-1-2-3-3-2’ and ‘Suwon38’ at the National Institute of Crop Science, RDA, Korea, in 1999, and selected for the further yield trials under the name ‘Miryang 23’. It was prominent and had desirable agronomic traits, such as high grain quality, lodging tolerance, and high antioxidant activity in the regional adaptation yield trials (RYT) from 2013 to 2015. ‘Hongjin’ was finally released as a new cultivar in 2015. ‘Hongjin’ has some distinct phenotypic traits, including a semi-determinate growth habit, yellow flowers, green embryonic axis, dark red seed coat, white hilum, and small spherical seeds (15.4 g per 100 seeds). The average yield of ‘Hongjin’ was 1.99 MT/ha in the regional yield trials (RYT), which was slightly higher than that of the check cultivar ‘Chungju’ (1.84 MT/ha) (Registration No. 7510).