Yo did not believe that the girl that he loved has died. He rushed to her side. To his luck, somehow Lavenge’s soul entered Oumavassy’s body. When she woke up she didn’t recognize the people around her. She told them that she was not Oumavassy,  but no one believed her. When she learned that she was to marry Yo, she refuse. Yo then made a deal that she has a certain amount of time to investigate who she really was and what had happened to her, otherwise she have to marry him..

Yo never really believed that she was not the woman that he loved. When they were with each other, Lavenge would always do things that Oumavassy would never be able to do. This really surprised him, but he still refused that she was someone else.
 
In the end she learned what had happened to her and at the same time she fell in love with Yo.