They all beat Murugan, and Aishwarya's father wants her to remove the mangalyam tied by Murugan. Aishwarya fears that if she does not obey her father, then Murugan will be killed, so she agrees to marry another man to save Murugan's life.
Murugan was defeated by everyone, and Aishwarya's father demands she remove the mangalyam he has tied around her wrist.  Aishwarya fears for Murugan's life if she doesn't comply with her father's demand, so she agrees to marry another man to save him.