ML gets into an accident and his personality changes ?

• Shadow Love
• Lovely Swords Girl - from cold hero to very child like
• The Silent Wife - from nice to cruel
• Please Feel at Ease Mr. Ling - not super drastic but he's definitely a bit softer/warmer after the accident/amnesia
• Ancient Detective - not revealed until the end, but ML was once evil and becomes good after his accident/amnesia

Maybe:

Autumn's Concerto (amnesia)

Homestay - movie (amnesia)

Mimi (erased memory)

Mouse (gradually changing personality partly because of organ transplant)

Still 17 (ptsd, but the accident didn't happen to him, just in front of him, change personality due to guilt)

The Good Bad Mother (back to childhood)

The Master's Sun (changed personality)

Welcome to My Side - movie (amnesia)