Apple in Your Eye (2014)

Original title: 妹妹

The Zhou family has high hopes in giving birth to a son but was disappointed when Zhou Jiwei was born a girl, making her the third daughter in line. Because she was a disappointment to the family, she was only ever given hand me downs from her sisters. She felt no love from her family, but luckily she feels the love of a family from her neighbours. There she meets her 'brother' Dai Yaoqi and follows him around trying to be the best sister ever, however, he has never wanted to have a sister. As she tries her best to be close to him as his sister, she slowly realizes the feelings she holds for him are not love for a brother but something more.