
1st couple is meh. Both MC doesn't feel like they like each other. FL seems to be just horny and grab a chance to have sex. ML looks like he's in denial stage of liking her stepsis - I wouldn't comment like this if I haven't read the extra chap.
2nd couple - I feel sorry for the FL for being ignored. But I applaud their loyalty with each other.

This would have been better if she cut-off her ties with her toxic stepmother. I know that the stepsis are kind but having connection with a family like that is irritating.
I can't say anything for the ML and FL. They are both reasonable, calm and collected. They both compliment each other very well.
FL could have been a badass character but the cliched father of child should end up with FL happened. As for the ML, he's a freaking trash except for the last page. His sob story didn't even do anything to redeem his character. He doesn't deserve the kindness of FL and her family.
The kid is the saving grace of this manga. He's glare to the trash is so good!