Wow I did not see that twist coming at all!
The reason why Guy was in love with Millie is because Keys was in love with her!
Who could've figured that out when we learned that they may have coded the NPC!
Seriously though, as soon as we found out that "the girl" and Keys know each-other, I was thinking please don't tell me that Keys' love for Millie through Guy is supposed to be a twist.
It's actually a sweet love declaration but as a twist it was way too predictable.
It wasn't a twist for anyone but Millie.
Even the interviewer picked up on the attraction. Mouser was well aware of it too.
It was a plot point, not a twist.