High school student Chi Haixiang had a very rare disease - ""identical twins"", that is, his body contains his twin brother. His deformed body was ridiculed by his classmates. He believed that his stomach was hatching a life, that was his brother, but no one believed him, and everyone thought it was a teratoma. Gradually, in the growth process he suffered bullying, and he fell in love with his unformed broth. However, his sad growth changed due to Yan Teng, Teng Xi and Ji Lan. Five urban teenagers left the imprint of love and hatred in each others lives.