She was supposed to be just a tool to help him break off the engagement, to be disposed after use...

Helen Goodwin was hired to be the Somerset family tutor. She was supposed to be teaching the younger brother Henry, but for some reason the older brother Raymond Somerset began to take an interest in her. The handsome Raymond was rumored to be involved with many beautiful women, and the plain Helen wanted to stay away from the playboy. But she couldn't help falling for his affections. What feelings are hidden in his heart behind the handsome face?

(Source: Ridibooks, translated)