The master is actually the ML. Each of his avatars in the worlds where the host was sent, fell in love with the host.
The master could not believe that he will fall in love with another because he only loves one person who has already died. But it turns out, that the MC is the reincarnation of that beloved person. The ML only realized before going to the third arc.
This is happy ending. The ending is very satisfying.
basically the MC was the first host of the system and she got chosen by the system because the other systems ignored the MC. And the MC got so mad at the other systems LOL
the one who killed the original MC in the first place was the ML. Because remember the car that hit her? It was a sports car. The only thing Im missing is the reason. But it seems that the real ML was going to different worlds collecting all those MLs and fuses with them. So it seems that the ML is stalking her even in the 3000 worlds. (O_O) '
the MC finally felt something for the ML. In previous arcs, it was never the MC who was in love with the ML. It is always the client who loves the MC. When she takes over the client, what she felt is empathy. Meaning she just feels the original feelings of the client, but never hers. But in Arc 4, the MC finally realize that she is beginning to be moved by the ML. She feels that only in this lifetime was she able to feel as their first life together. (The ML reincarnates to where the MC is as it was their promise to each other on the first Arc).