Lead returns X years later and is a completely different person

Lead comes back with different personality but same identity/appearance:

• The Princess's Man 
• The Last Princess 
• Crush (maybe? FL's personality and possibly the ML's personality changes a bit during the years they're apart)
• Eternal Love of Dream (FL somewhat when they reunite, ML too since he's sick)
• Have a Crush on You 
• My Deepest Dream (ML somewhat at the beginning)
• You Are My Destiny (FL somewhat after the leads separate and reunite)

Lead comes back different (appearance or personality) as the result of reincarnation/rebirth:

• First Love Again 
• Island 
• Love Between Fairy and Devil (FL's faking it.)
• See You in My 19th Life 
• Tale of the Nine-Tailed 
• The Legend of the Blue Sea 
• The Legends 
• The Starry Love (maybe?)
• Tomorrow (one of the characters)

Lead fakes death and comes back with different personality and/or new identity:

• And the Winner Is Love
• Lovely, Still
  
• Moon Embracing the Sun 
• Mysterious Love 

Lead comes back with disability:

• Perfect World 
• Silent 

Lead comes back with same personality but different appearance (and possibly new identity):

• A Familiar Stranger
  
• Chains of Heart
  
• Jun Jiu Ling 
• Love of Thousand Years 
• Princess at Large 2 
• Renascence 
• The Only Girl You Haven't Seen 

Other:

• Untouchable Lovers (both leads have their memories wiped, acquire new identities, and become somewhat different as a result but their personalities don't change much)

I have a Lover

Ten miles of peach blossom