Both are adorable fluffy romcoms.
Both leading ladies have an opportunity to further their careers after much disappointment, in that area... but the career opportunity brings them in close working relationships to men from their past. In A Girl & Three Sweethearts (you can find it here: https://dramacools.to ) she moves in with the man she has long had a crush on... but there are two brothers in the house that might turn her affections elsewhere.
In My Secret Romance (find it on dramafever), it is a man she had a one night stand with 3 yrs ago . Of course, there is already a man in her life, who is waiting for the right time to confess to her... but who will she be more moved by.
There is plenty of wondering if "he loves me/he loves me not" and "she loves me/she loves me not" in both. There is also adorable awkwardness while trying not to let on that they like them, but also wanting to do sweet things for them.