Erya was an abandoned baby who was abandoned by her parents at the gate of the orphanage when she was just born. The director adopted her and named her Erya after his own surname.
When Wen Wen was six years old, he was found to have a heart disease. His parents couldn't afford medical treatment, so they left him in the hospital, hoping that some kind-hearted people would help him with his treatment. After his parents left, Wen Wen secretly went out to look for them, but the city was too big to find him. As a result, he got lost and accidentally ended up at the orphanage where Erya was.