In both dramas a look alike switches places. Unlike many dramas where there is blood relationship between the people who looks alike there is none in both cases.
Both have female leads who fall for their 'brother'. In Prince William it is her brother's look alike but in 'That Winter, The Wind Blows', the female lead is blind and falls for her long lost brother came back who is actually a fake.
By strange fate the leads get close to the other lead who looks exactly like their loved one. In prince William the ML is her brother's look alike where as in My Lethal Man it is the girl who is the one with similar looks with another girl
