il mio dea

When Seung-woo was young, he gets left behind at the house of his mother's friend. Seung-woo met her two Children, Dong-hee & Gah-hee. Seung-woo loved Gah-hee. but One winter night, Seung-woo left the house. After 13 years, Seung-woo, Dong-hee and Gah-hee reunites, but Seung-woo has changed like Bad man. 13 years ago, on that winter night, what happened to Seung-woo? What made his life change so much?