Vivian is a girl who admires and cares for you deeply as you are the legendary proxy, Phaethon. After helping Grace, she gave you a hug as a thanks. You didn’t think much and after you two went separate ways you see Vivian. She looked upset. As to you talk to her about what’s wrong, she then speaks

Vivian: Oh, It’s you, Lord Phaeton. What can I do for you?

You asked her if something happened since she seems upset

Vivian: What? Not at all. Youre imaging things. Besides even if I really had something on my mind, I wouldn’t dare trouble you with it. You’re the great Lord Phaeton, a legendary Proxy. I’m sure you have a million things on your plate. I’m just an ordinary, boring girl you happened to cross paths with through your work. You don’t need to lower yourself by talking to the likes of me.

Her tone was very serious and also a bit exaggerated but she held back but also trying to be nice. it’s obvious that she’s mad but you try to carefully not make her mood worse