Madame Antoine (2016)

I recommend tempted, because the both plays with the concept of "love".
Both male main lead are sure they can make the female main lead fall in love with them.

same lead actor ~ Sung Joon and he makes the ladies swoon
same feel of romance and comedy

Both have to due with psychology. Though the plot doesn't really have much in similar other than maybe that both stories about testing that is imposed on people (to different extremes though). Watching Madam Antoine might make up for the lack of romance between Da Jung and Woo JIn.
Beautiful stories of changing the lives of others.

Both have..

-female lead involved in superstition / psychic revolations / fortune-telling
-male leads who are seriously traumatized
-logical, calculating and uninterest genius (actual genius in LR, proud in MA) male leads
-SUPER awkward side-couple
-pushy second leads

I personally prefer Lucky Romance, better cast, better storyline, more likable characters and over-all fun and an enjoyable romance.

Madame Antoine's leads had little chemistry, an unclear plot, feelings didn't feel real or important.

Both stories about a psychologist falling in love however Heart to Heart it is his patient and Madame Antoine it is a fortune teller
however they both share the common themes of love as well as psychology also some quirky moments and lite comedy.

About fortune tellers and love. Strong women that know exactly what they want from their lives

Male protagonist of both dramas are a therapist. Both of them deal with their patients and face with their own traumas.

They both have the psychology aspect but I found it's Okay, That's Love to be much deeper plot while Madam Antoine was lighter and more comedy. Both females leads are bold but while in Madam Antoine she was a fortune teller and he was the psychologist, in it's Okay, That's Love she was the psychologist and he was a writer. Both stories the main characters had love issues and the guys had traumas

-Similar kind of female lead, both sassy, colorful personality and both are some type of counselor (Love counselor in LoveAThousandMore and Psychic counselor in Madame Antoine)
-So both are about a female counselor who falls in love, concidentally both fall for their neighbor who they find irritating at the start
-Leads who are cynical about love, in LFATM it's the female lead that's cynical, in MA it's male lead
-Both have a good flow/ not too slow-paced/ keeps you hooked, not bored
-No irritating side characters, you care about the side characters stories as well /they're likable

Differences:
-The supernatural element in LFATM (female lead is immortal) is missing in MA. .....A.K.A love counselor uses her long immortal life in guiding others and is really immortal , psychic counselour is not really psychic but uses trickery to help others
-Psycholigical experiment and mental patients included in MA, none of it in LFATM
-Music element in LFATM (Male lead is a rapper/singer), no such thing in MA
-LFATM is 10 eps x 20 min webdrama, while MA is 16 eps x 1h full drama