Both are short length, gently paced dramas in which a couple marries before falling in love. Both center around the FL finding her new life with the ML's family, as well as getting to know the ML.
FL has a contract relationship with the ML (pretending to be his sister vs. being his wife for a short while) which is to benefit the ML's father in some way. Both are mini dramas.
FLs are both feisty
MLs don't know how to handle the FLs and get flustered
MLs gets jealous easily
Both leads fall for each other pretty quickly
The chemistry in both are so cute
Both have a similar feel even though the story is different
Both are short dramas
Both are a light easy watch
FL ends up in a forced or contract marriage with the ML who is either a general or the son of a general. The marriage ends up growing into love. Both are light romantic dramas with happy endings.
Arranged/contract marriage between the FL and the ML who is either a general or the son of a general turns to love. Both are mostly light dramas with a sweet relationship between the main couple.
Lower class FL accidentally ends up in a marriage with the ML (contract vs. switch) but ends up falling in love. Both have lovable bandit characters (FL and her "brother" in HOML, SML in TOD). Both dramas are light and romantic with very happy endings.
FL has a contract relationship with the ML (pretending to be his sister vs. being his wife for a short while) which is to benefit the ML's father in some way. Both are very short and sweet dramas with happy endings.