I've Loved You So Long movie plot

In Nancy, France, Joliet, who was imprisoned for killing her 6-year-old biological son, stood in front of her sister Lia again, which also brought subtle changes to the happy life of her sister's family: An unpopular older sister has grudges and wants her to move out as soon as possible; the younger sister spares no effort to help her re-enter the society, but it brings heavy troubles to her mentality; the two adopted children are strangers from the beginning to Gradually, he fell in love with this aunt who likes to smoke and love to be silent; the father-in-law whose sister had a stroke was locked in his room all day to read, but he did not object to a new tenant who was as silent as him. Slowly, my sister integrated into the living environment here, found a new job, made new friends, and her family fell in love with her. At this moment, my sister accidentally discovered the truth of her sister's murder of her son 15 years ago   .