Both are Makjang Dramas. Both have a wealthy family that is tied to a poor family. Both have a main character that deals well with a disability and plays piano. In Can You Hear My Heart it is Deafness and in You Are Too Much it is Blindness.
You Are Too Much will be 50 episodes and is categorized as Drama, Family, Music - Music business is featured
Can You Hear MY Heart is 30 episodes and categorized as Family, Melodrama, Romance. - Romance is featured