Yoon Bomi accidentally farted on a cheesy guy she bumped into at the subway. The guy vomits and she swore that she would rather die than to face such embarrassment. She bumped into the guy again at a library, the guy noticed her but she ran away. And things get worse when she bumped into the same guy again at some digestive clinic. She could never imagine how absurd she looked when she finds out that the guy she had occasionally bumped into had the same digestive problem as hers, and that's when she knows Nam Woohyun, the constipated guy.