Bong Woo Ri (Hwang Jung Eum) was raised by her deaf mother who got married to Bong Young Kyu (Jung Bo Suk), a mentally disabled but innocent man. With this, Bong Woo Ri gains a step-brother, Bong Ma Roo (Nam Goong Min). At the same time, Bong Woo Ri meets Cha Dong Joo (Kim Jae Won) who is supposed to be an heir to a rich company.
However, Bong Ma Roo's real father wanted Dong Joo's wealth for himself so he married Dong Joo's mom and killed his grandfather, which were all witnessed by Dong Joo and caused his accident. The accident rendered him deaf. To top it off, Bong Ma Roo's father (without him knowing) is also at fault of Woo Ri's mom's death. To run away from all his problems, Ma Roo abandoned his real family and grew up as Dong Joo's brother Jang Joon Ha. All the while Joon Ha helping Dong Joo get over being deaf by helping him read lips.
Some years later, Dong Joo, Woo Ri and Joon Ha all meet again.