Some people regard love as a kind of obsessive-compulsive disorder.
Eight-year-old Su An took a letter and went to a city thousands of miles away to join her "father" Jiang Yi.
Jiang Yi, who was completely confused, didn't know Su An at all, and he didn't even know the mother of the child. Because of the pressure from his family, he started a father-son life with Su An.
Who is Su An, and who is his real mother?
The happy life of pseudo-father and son is underway.