They both are arranged marriage dramas. Both have humorous and lovely scenes that livens up ur day. The main girl lead for both drama knows martial arts and the main guy for both drama investigates cases too.
Chef Fang (2017)
Similars
If you like Lovely Swords Girl, you'll like Chef Fang as well, it has the same sunny vibe.
Similarities:
* unusual love story, first love
* funny leading couple
* they didn't "do" it at their wedding night
* both have caring families
* love leads to transformation
Differences:
* both male leads are sharp-witted, educated and sarcastic, but in Lovely Swords Girl the male lead changes into a sweet puppy when he looses his wits
* Chef Fang is family romcom, Lovely Swords Girl is Wuxia/action drama.
The general vibe is the same especially with the side stories and both couples are really cute.
If you like Mengfei Comes Across you'll also like Chef Fang.
Chef Fang and I've Fallen For You have some similarities:
* a nice girl falls deeply in love with a roguish guy, she wins the hearts of her in-laws and later of her husband;
* the bridegroom changes for the better because of his marriage
* both have a leading character with a royal origin
* the marriage of the ML and FL isn't consumed
* the ML and FL solve mysteries together
The difference is
* In Chef Fang the girl is from noble birth, in I've Fallen For You it is the boy
* One girl is accomplished in cooking, the other in forensic research