Suppose it would be Beloved Lu, that doesn't say anything about the endgame though. Obviously Lu is major part of the story, even if she hasn't played as much a dominant role, her presence is still pretty apparent and now with this chapter, now that we know they've known each other since forever, and we already knew a lot of shit has gone down between the two of them, and how it damaged Wei Wei etc.
I find it more to have a bittersweet feeling to it, in the sense of "Oh my beloved Lu, how I loved you and devoted myself to you etc. but then you had to go ahead and destroy me, my beloved Lu, how we could have had such wonderful things but you threw them away.
My beloved Lu, I have found someone new.
My beloved Lu.
My once beloved Lu."
Something like that.