IBU, which stands for the International Bitterness Unit, is used by beermakers to measure the bitterness of beers. Most people can perceive the bitterness starting at 12 IBU. For Chen Zui, Zhen Tian is his measurement of sweetness. 12 units of sweetness just so happen to be enough to make him intoxicated. — In short: Beer is bitter, but you are sweet. The female lead works in the beer industry, and the beer-drinking male lead works in the media. A short sweet story.