The Mistress's Daughter Claims Legitimacy

In my second year running the company, my high school class monitor suddenly started tagging me nonstop in the group chat. [Alice, Vivian was only joking with you back then. Why won't you come to her party? Are you trying to make her feel guilty?] I didn't understand what was going on. Only after reading the messages did I realize that our class beauty, Vivian Spencer, had recently found her biological parents—and today, she had thrown a party to announce it to the world. Me: [I'm busy.] I had no intention of attending a party hosted by someone who used to bully me. But my answer didn't shut them up. Instead, it stirred up even more absurd speculation. [Don't tell me you're doing some kind of labor job and can't take leave?] [We're all former classmates. If you show up, I'll give you sixty dollars. That should cover two days of your salary.] Vivian chimed in as well. [Alice, it was just a joke back then. And I'd already dropped out by then. Why can't you let it go?] I stared at her message for a long moment before typing: [Only trash would call bullying a joke.] The group exploded instantly. [Vivian's no trash! She's a wealthy heiress. She's not even in the same league as you. Poor people really love to nitpick.] Vivian, ever the hypocrite, tried to smooth things over. [No matter what, today marks a new beginning for me. I hope you'll come to witness it. [We're classmates, after all. I don't hold it against you for forcing me to drop out. If you're short on money, I can even ask my dad to arrange a job for you.] Then she sent a screenshot of her chat with her father. When I saw her father's profile picture, I froze. Wasn't that the same profile picture as my freeloading dad? But I look seventy percent like my mom—it's impossible for me to be a fake daughter. And Vivian was two months younger than me. I let out a laugh. "Alright, I'll definitely attend your recognition party."