Both are mini dramas
Same historical setting
In The Only Girl You Haven't Seen FL soul is transferred to another body from same world, while in Bossy Husband Who Loved Me FL enters into a character in the book she's writing.
Both start with MCs wedding
Great chemistry between leads
Strong and smart MCs

FL shifts her soul into a different body
Strong and smart Female Lead and Male Lead
Hidden Identity - both FL and ML
Fighting scenes/Martial arts/magical powers

"The Only Girl You Haven't Seen" is a mini drama with 2 seasons, easy watch - there are s1 and s2 full ver. on youtube with English subtitles. (Chinese drama)
"Alchemy of Souls" is a normal lenght drama with 2 seasons - on Netflix. (Korean drama)