Chen Nian gave up her life because of a thought. After her death, she thought about how much her parents loved her, and she regretted it.
At this time, the system suddenly appears and is bound to her. As long as she completes the system's tasks, she can be resurrected.
The first world is to travel back to the fourth daughter of a family that favors boys over girls in the 1990s, changing the miserable life of the original owner caused by her original family.
The second world is to travel to the daughter of a farmer whose parents were weak in ancient times, and change the tragic fate of being plotted by her uncle's family.
(Special note, the heroine in the first world is still transforming and growing, the system is not involved, and the pace will be slower.)