Choi Jinyoung has invented a water purifier, Chrystal Clear, to maintain humidity using water thrown away. It is designed based on water and tree making oxygen and makes people think the nature importantly and appreciate it. People drink around 1litre of water a day on the average, but they don't drink a full glass of water always. Water is discarded after drinking and cannot be used again. Assuming that only 5 percent of 1l of water is discarded daily, it will increase by 18 l. within a year and 109,500,000,000l of water will be thrown away every year at the end. If we convert water into the air, there will be no more water thrown away and people will be able to live more healthily, says designer Choi Jinyoung. Using water thrown away, adjust the humidity of a user space to the most proper temperature.