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There's not much in common between these two shows but I will say there is one key detail that makes them similar...

In Secret Garden,
the second lead, Choi Woo Young (also known as 'OSKA'), has a difficult relationship with the second female lead, Yoon Seul, after she overhears him dismissively telling a mutual friend—who happens to be interested in her—that she was just a fling and meant nothing significant. This deeply upset her, prompting her to break up with him and take a long trip to work on herself. Upon her return, she sought revenge by making herself an unavoidable presence in his life, serving as a constant reminder that he wasn’t the only one affected by their breakup. Her actions eventually drove him to make reckless decisions.

In When the Phone Rings,
the leads Baek Sa Eon and Hong Hui Ju are two married strangers, who happen to be put in a hostage situation over the phone. Baek Sa Eon response leaves Hong Hui Ju devastated and disappointed. Right then and there she decides to seek an opportunity for revenge. She impersonates her kidnapper by calling him through the phone the kidnapper used. She seeks an opportunity to make him miserable for not caring enough for her on the day of the kidnapping. While seeking freedom from her marriage she is given the chance to speak out her bottled-up feelings.

These stories are not the case of a usual misunderstanding in dramas but a case of miscommunication of feelings.

It has the exact same dynamic the angry one falling in love later on but being too dramatic to open up about it

Both FLs had a past connection to the ML when he was a child, she then dies and is reborn. Years later the FLs reunite with the ML who is now an adult and have never forgotten her, as well as the family they left behind in their past life.

Both are love stories between a police officer and a Doctor. They both meet during an accident involving dismantling a bomb. the only difference is the couple in Love Song in Winter were once lovers

Very similar with the palace and political conflicts. Both the male and female lead characters are or become righteous and influential with strong moral compasses. Both female leads may seem weak at first but they quickly change and become strong, quick thinking, decisive, and upright women. Both men show loyalty and bravery.

If you enjoy a well constructed plot and characters you can really root for; not just the leads but also many of the people surrounding them; then you will love both these series.

Found family trope in both
Small village
Introverted male leads
Struggling female leads
Overcoming challenges
Female leads finding themselves
Beautiful side character stories

A found family, triller and it's mysterious power centered. Buy one is gore and the other is more light. But I'd you enjoyed one you should enjoy the other.

The tyrant is filled with assassins, a badass female lead with special abilities and have a great actor cast. It's only a few episodes , but it's as gore and bloody as this one. Verry enjoyable.

They basically could be in the same universe. In this the female lead has just escaped from where they were confining her and she is just figuring out the outside world. She is still young and other members are after her.

They are both verry gore and have a strong female lead. They both are centered around a big organization that locked up kids, looking for the one who escaped . They are somewhat the same show with one where the girl escaped with her friends and formed a family and the other escaped alone and fighting with herself. I really think they could be in the same universe.

The hearwarming family with their children bring problems to them. And one of the daughter is the doctor is similar to the character of second daughter in Korean drama.

Both have a married woman investigating a crime that may have ties to her husband. Both husbands are wearing masks of harmless innocence, happy go lucky, but they're hiding dark secrets.

Both shows have a rich, cold guy who loses his memories and becomes innocent. He's helped by the FL in a rural setting and they fall in love. What happens when he regains his memory?

If you like a show who had everything to be great then degenerates into gratuitous domestic violence.

-Both dramas include demon or monster hunting.
-Both were set on historical setting and has supernatural and wuxia elements.