As far as i know it was a QT. The mc trans migrated to a body that was sick he has a heart disease i think and he was very loved by the parents. And he has a sister as far as i remeber they were twins and the sister was jealous of the mc and bullying the mc when they're parents are not home hitting the mc where other people wont see and the ml's family is friend with the mc's family the ml even proposed to put cameras in the mc room to see what happened. One time the sister beat the mc to the point the mc has a very high fever when the parents found out what the sister was doing they kicked her out that. And that's all i can remember.
I'm not quite sure whether this is the one you're looking for or not because it's a little bit different from what you described, but I remember there was a twins arc in FOD, but it was the sister that had heart disease
Thank you but no it was the mc i have read FOD a lot of times and remember each arc so im sure it was not that. But thanks anyway
This is definitely arc 1 of Chasing you https://www.wattpad.com/story/152602153?utm_source=android&utm_medium=link&utm_content=story_info&wp_page=story_details_button&wp_uname=mochiiMALLOW&wp_originator=lk89cWEXByoQvrWN9uudIyeWHk2eW+sFTR3G6lOWvRYWzqmDtOxZZXom+8knmowhqoyxdEA9UtIwwQL1/PuFaqnwqS5xRtzWAk03hfl7kRwa2NQ6FihBMZfnGRqHyXfa The system is bao bao, right?