A girl is about to die from starvation when a soul of a person who died somewhere else goes into her body. Seing that her body is going to be taken over by the intruding soul, she uses the last of her energy to fight it. In the end she ends up destroying it and gains the life energy of that soul along with it's memories. Because of the additional life energy, she can remain alive in her body but needs to refresh the power of her soul by killing people and obsorbing their souls. She finds that she can use her life energy to keep her body youthful forever.
She uses the memories she obtains to monopolize all lines of business.
A while later(a few years later)... she is making a business deal with someone when she runs into a man running toward somewhere in a hurry. It was love at first sight. It turned out that the man was a local actor and he was late for his show. The two started meeting and soon they decided to get married. No one was against it since she was a successful and rich woman and he was a famous actor from a good family.
But on the day of their wedding, through a series of bizarre* events, he is injured and is about to die when he wakes up completely fine but with no memory of what happened. He suddenly has intensive medical knowledge that is greater than what she obtained from the souls she observed. She thinks that another soul took over the body of her lover and tries to kill him but ends up falling in love with him.
Before she had to hide (from lover) that she devovers souls to live, now she does not have to do that with him since he already knows and accepts that.
Even though she is sad about her lover's death, she starts to like him. However, the newly transmigrated soul likes another girl. The girl then tried everything in her power to make him fall in love with her.
*Bizarre as in a kid tripped on a stone and landed on a stall selling pies. Because of this a pie was thrown in the air. A messenger bird that was flying in the air did not stop fast enough and collided with the pie. The mechanical (or magic) bird activated it's self defence mechanism and lit on fire to get rid of the pie on its face so it could see. Desperate to get rid of the pie, it lost balance and fell from the sky. It landed on a butcher who was cutting up meat. Out of surprise and pain, the butcher threw his blood covered knife in the air. The knife landed next to the girl's lover, and covered him with blood. A creature (a wedding gift) that is usually beautiful and kind until it smells blood charged at him and mortally wounded him.