FL is either mute, deaf, or blind

Angel's Last Mission: Love - FL is blind

Love and Destiny - There is reincarnation/multiple lives. In the second life the FL is deaf

Orange Days - FL is deaf 

That Winter, The Wind Blows - FL is blind

FL is blind for most or all of the drama:

• +1 Koi Desu: Yankee-kun to Hakujou Garu
• +1 That Winter, The Wind Blows
• Page Turner

FL is blind for part of the drama:

• Eternal Love

Until Rainbow Dawn - GL movie with many deaf people. (if you don't mind lgbt)