In his previous life, Felix Quick was neglected by his family and killed by his foster brother Harold. Before his death, Felix felt disheartened by his family, but when he woke up again, he found himself back on the day of his twelfth birthday, ten years ago. At the age of twelve, Felix was adopted by the Quick family, thinking he finally had a family, only to realize that they valued another foster son, Harold, much more, leaving him with only coldness and misunderstanding. In his previous life, Harold falsely accused Felix of adding an allergenic jam to the cake. This time, Felix did not deny it; instead, he cut ties with the Quick family on the spot and ran away from home.