"What is Love" centers around two close families with sharply contrasting values. One consists of medical resident Lee Dae Bal, his mother and father and his younger sister Sung Shil and is conservative and patriarchic, the other consists of college student Park Ji Eun, her siblings Jung Eun and Jung Sup, her two maternal aunts and her parents. They are progressive, modern and utilitarian. This drama comically portrays the troubles that arise as these two families become quarrelsome in-laws by Ji Eun and Dae Bal's marriage and the conflicts that arise between Ji Eun and her in-laws, delivering a message about the importance of balancing traditional and progressive values.

Teruko is a 28-year-old office worker. 5 months ago, she fell in love with Mamoru at first sight. Since that time, she has not cared about her work or her friends. She then loses her job and her friends look at her coldly. Yet, Teruko is happy as long as she is with Mamoru. Meanwhile, Mamoru thinks Teruko is an easy woman for him to not love. Teruko's unrequited love grows deeper.

It's Valentine's Day and Tom has big plans. He's about to get engaged and has a surprise party planned to share the good news with friends. But things take a turn for the worse. Tom returns home only to discover his girlfriend has packed up and left him. Now, instead of a surprise party, the surprise is on Tom. Fortunately, his friends are there to help him make sense of it all.

Three sto­ries that explore love, com­mit­ment, and loy­al­ty between cou­ples and friends. "Two for Din­ner" where a mar­ried cou­ple tem­porar­i­ly liv­ing in two dif­fer­ent loca­tions are more sep­a­rat­ed than they think. "Sail­ing Les­son" about a long-mar­ried cou­ple who spend a day on a sail­boat rekin­dling their romance… and unex­pect­ed events arise. "Late Lunch" where a young woman who recent­ly lost her moth­er gath­ers togeth­er a group of her moth­er’s friends to share mem­o­ries, with sur­pris­ing rev­e­la­tions.

Hanna, who’s totally connecting with a hot DJ-guy in Berlin and is heading down to his gig, misses the train, which leads to an unwanted road trip. Will Hanna and dj___snorksenzation__000 become a couple tonight? What’s cool and who’s not? Are all middle-aged men perverts?

After spending many years as husband and wife, the architect Andrea discovers that his partner Francesca is cheating on him with Ernesto, his best friend. Andrea decides to forgive them, but as time passes he realizes that he wants to win Francesca back and decides to play all his cards during his rival's absence...