The Manifested Split Personality (Protagonist Pursues)

A story about two sides of one person fighting over the body: sixty percent of them are cold and unfeeling, while the other forty percent are sunny and optimistic. The side in control and the side forced to watch the show are locked in a love-hate battle... How could that be possible? They're just one person. Actually, this is a story about a clueless goofball who gets a golden finger and learns how to fall in love. (Brace for thunderous drama = -)