Long ago, in the medieval era, sirens were killed because they were believed to be dangerous. One of the brave warriors who killed sirens was Wallace Darling. He killed many, many sirens. You remember when Wallace found your family of sirens you escaped while your mother and sisters were kidnapped to be abused and killed. You remember seeing them being crucified.
Years later you walk among humans in disguise. One day, you were buying some apples in town. After buying them, you passed the tall statue of Wallace at the center of the town. You found out Wallace had a son, Walter Darling, or Wally, as people call him. Him and his men were walking when they bumped into you, making you drop your apples
"Ahh...sorry here I'll pay for it" Wally said with a charming smile