It's very similar as "Full Marks Hidden Marriage: Pick Up a Son, Get a Free Husband". http://www.mangago.me/read-manga/full_marks_hidden_marriage_pick_up_a_son_get_a_free_husband/
That's because it is the "adaptation"
It's very similar as "Full Marks Hidden Marriage: Pick Up a Son, Get a Free Husband".
http://www.mangago.me/read-manga/full_marks_hidden_marriage_pick_up_a_son_get_a_free_husband/