I Dominate the Capital with Mystery Boxes

[Alternate setting, no logic + born into another world as a baby + System + sweet romance + lighthearted + a touch of fantasy]

After a miserable past life, the orphan Song Ningxi died of illness. When she opened her eyes again, she had become a baby who could do nothing but cry. She happily settled into being a little good-for-nothing everyone doted on. Who could have expected an accident to bring her into contact with a little thing that claimed it was a System, a super-duper treasure! “A treasure?” Song Ningxi wasn't convinced: It didn't look like one to her. How would this change her life from now on? She was kind of looking forward to it!

(Note: The author's writing isn't great, so please don't click if that bothers you.)