Manga:
Ning Xi and Lu TingXiao send Little treasure to a school, afterwards Ning Xi changed her clothes and LTX saw scar on her abdomen -> make an investigation -> find out NX is Little treasure's biological mother.
Ning Xi find out an investigation results later and they had a discussion.
Novel:
Nothing like in a manga.
Ning Xi on her own told LTX what happend to her (hotel and child incidents)
Then LTX made investigation, found out that it was his room and NX lost her child on the same day that Little Treasure was send to Lu family. And after some time LTX made private paternity test and found truth.
NX will know that she is a biological mother almost at the end of novel.
In my opinion by this change of plot manga's author destroyed a great part of original. all struggling of FL when she tells ML her past in several occasions and ML's struggling when he found that he is a source of FL "nighmaires".