In my opinion, this is a pretty good novel. It’s light and fluffy, with a dash of heavier themes sprinkled throughout. As someone else mentioned, the author doesn’t explicitly explain how or why the main character (MC) is chosen by the system, or why a 3-year-old child refers to the man as her father, or "Daddy." However, these details are subtly woven into the story, though they become clearer after Chapter 20.
For me, the MC is both happy and pitiful at the same time. Spoilers ahead, so be warned.
**Spoiler**
The MC, a 3-year-old girl, is chosen at random by the system. Or, as the author describes it, a government or entity on the side of order decides to implement their system in the world. What makes the MC pitiful is that she is forcibly chosen and given the system, then thrust into a battle against the source of chaos in the world.
In her original world, the MC was a poor child who endured abuse from her mother. One day, when she was on the brink of death from starvation, the Villain saved her, nursed her back to health, and then disappeared.
After gaining the system, she is transported to a parallel universe to prevent chaos from overtaking that world. The source of chaos is the same man who saved her before, who treated her like his own daughter, but in this world, he doesn’t know her. This is why she calls him her father and fears that he has forgotten her.
The MC keeps being thrown into different parallel worlds after the chaos in her current world is either eliminated or suppressed. This happens because the system finds her useful in stopping chaos, or at least the person causing it. However, each time she is sent to a new world, that world’s villain doesn’t recognize her. This leads her to repeatedly gain the recognition of that world’s villain, or her father, confirming that she is his daughter. It’s a mix of cute, light, and fluffy moments, with a dash of bitter black chocolate.
So, I suggest reading further in, or at least finishing the first arc, before fully criticizing this novel.