Millennials are putting their stamp across the world, making real their aspirations in ways that previous generations might never have thought of. Our series, Big Plans Take Time, delves into how young people took bold steps to achieve their dreams. Bryant Chan speaks to creative agency HighSpark's co-founders Eugene Cheng and Koh Kai Xin, our 24th profile, to find out how they turned their two-person startup into a business that made six figures in revenue last year.