30 Kin Sore wa 30-sai Miman Okotowari no Koi (2020)

Both are short dramas in which the FL is an older professional woman whose younger male co-worker begins pursuing her.

Sakurazawa Jun is 27 years old and excels in her job, is fashionable, has many hobbies and lives a very fulfilled life. Her life is driven by her primary motto "love is just a waste of time!" and she has no experience in romantic relationships or with men. Before her appears Nagamine Shuma, an incredibly handsome chef in training who knows exactly what women want to hear and feel. He's someone who lives in the moment, lets people come and go, is cool and not serious about love. For some reason, Shuma is intrigued by Jun and decides to approach her...

Both are romances between an older FL and her younger co-worker ML who falls for her first, causing her to have to choose between him (who she ends up falling for) and the SML who is age-appropriate but she doesn't love. Both have an office setting and both FLs have overbearing mothers who are pushing them to get married.

Both the protagonists of these dramas are 30 years old and start a relationship with a boy younger than them.

Sakurazawa Jun is 27 years old and excels in her job, is fashionable, has many hobbies and lives a very fulfilled life. Her life is driven by her primary motto "love is just a waste of time!" and she has no experience in romantic relationships or with men. Before her appears Nagamine Shuma, an incredibly handsome chef in training who knows exactly what women want to hear and feel. He's someone who lives in the moment, lets people come and go, is cool and not serious about love. For some reason, Shuma is intrigued by Jun and decides to approach her...

Both are short dramas about a love story between an older office working FL and a younger ML. Both MLs are sweet and loving.

Both female protagonists of this drama are older than their male lovers. In both dramas there are scenes of coexistence between the protagonists.

Both female protagonists of this drama are older than their male lovers. In both dramas there are scenes of coexistence between the protagonists.

They are both noona romance that happens in the office area.
The vibes are really different, since Jdramas produce very straightforward and short dramas.
Both stories show challenges the couples face despite their age gap.

Older lady and Younger boy relationship that will end up to happy ending and being with together for like forever. And even wedding and marriage.

I can't say this title is exactly the same subject of jdrama but it has vibes of age gaping subject and affair of younger boy and older women. And a little bit cheating ?