
Yep, http://m.kuaikanmanhua.com/mobile/1080/list/
This is the link.

I don´t remember what chapter it was but they had a flash back in ther about it. So back hair guy´s father owed people mney and the night he said goodbye to her they beat him to death. And threatened him that if he doesn´t pay back the money his dad owns the they will hurt the girl and his family since they know where everyone lives because they have been following the for the past week. So then he remember what the black hair girl told him, that unless he becomes one of the top dogs he will have to suffer for the rest of his life. So he left the mail girl to protect her and make enough money so those people don´t botter him or the girl. Sohe left her because he loved her kind of.

Hyeee. I seem cant open the chapter where u said she had her daughter??? Which was it?
The end? What's the use of that black-haired guy with MC to begin with? He didn't even explain why he abandoned her.. I would love this story even more if Mc and the black-haired guy didn't be in a relationship.