Boom-Sook Kim is a postgrad student at Taemosan who enjoys drinking, gambling, and crossbow hunting. He ostensibly uses Sonmi~451 as a research subject, but because he skates by on nepotism and his rich father, Boom-Sook mostly ignores his work, leaving Sonmi to pursue her own interests. Although Sonmi appreciates her arrangement with Boom-Sook at first, he nearly kills her when he accepts a drunken bet to shook fruit off her head with a crossbow. Boom-Sook represents how the whims of rich buffoons can have life or death consequences for the people around them.