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Both are Boys Love series with a supernatural element, where a otherworldly person and a regular person fall in love.

Both are romantic boys love series that are different from the usual tropes of the genre, with very nice casts and great production values.

They both have similar story concepts (famous girl, "regular" guy) and the lead males and females f both shows are really kind hearted overall good people.

45-year-old Rui Nakamura (Kyoka Suzuki) is a highly successful publisher. During the course of work, she encounters a 28-year-old married man named Kou Suzuki (Hiroki Hasegawa) who aggressively pursues her

Hitoshi is attracted to Rei (step mom). Rei begins to realize that what she wants from Kazunari is not love, but her late father's shadow

Toru, a 20-year old man, falls in love with a woman who is not only married but also 20 years older than he

Secret Affair" tells the story of secret romance between Oh Hye-Won (Kim Hee-Ae), a woman in her 40's, and Lee Sun-Jae (Yoo Ah-In), a man in his 20's.

Well the way the main characters meet each other is kinda similar and
The acting story and specially the songs are wonderful.
So if u liked accirr in love you will definately like Cinderella with 4 knights

Lawless Attorney and City Hunter are both exciting tales of revenge. There is a lot of action in both series.

Both Refresh Man and What's Wrong With Secretary Kim have few similarities, such as leads knowing each other when they were younger, the CEO/ employee relationship, the impossible to please boss, rich man, poor woman trope. The reason I do recommend Refresh Man if you liked What's Wrong with Secretary Kim is they both are written well despite their overuse of certain tropes and cliches.

Both are based on a true story, a strong relationship between two people from different countries. Both will probably make you cry han-river and giggle at some parts.

Human female falls in love with a merman king who has limited time to live as a human. Unusual circumstances lead to cohabitation, a strong bond, and friendship between them.

Human man falls in love with a mermaid, tries to protect her secret and keep her safe.
They both know if humans find out she is a mermaid, they will want to exploit her.

The Twists and plots co-relate. Both Dramas focus on a young boy avenging for previous misdeeds caused to them..

Only difference between the two is in CSL she's much more petty and hateful towards him, and the triangles aren't so obsessive or repulsive as CSL, otherwise pretty same story just in a different setting.