Xiao Dahai and Zhao Chunyan adopted their lost child Xiao Dongliang out of kindness.Xiao Dongliang was in urgent need of surgery for congenital heart disease when he was young. The huge cost became a problem, and the two of them pinned their hopes on the unpaid wages.Xiao Dongliang's biological mother Su Yun, a well-known entrepreneur, is looking for her son's whereabouts.A series of stories followed.