Both office romance
Both MLs are the CEO of their company
Both FL work under the ML as a nutritionist at that same company.
In both shows the ML is unhappy with the food that FL makes for him at work and keeps sending the food back

Both the FL end up in a novel/WEBTOON and have a romance with ML. Both ML end up having a mind of their own and they go off script of what’s supposed to happen in the alternate universe . When I was watching this, I thought of W.

Rebirth and second chance at life.
They have similar plotline where FL dies then wakes up in the past with knowledge of what happened in the future.

ML here & FL in South Wind are both doctors. Similar storylines. Both shows open with them going to a foreign country to treat people. Meet the ML/FML on the way. Both medical and melodramas genre.

Both shows have romance and Kim Young Dae is the ML. he plays a top celebrity/actor in both. His character can be seen acting within the show. Both 2ML were in penthouse.

The main lead goes back to the past as a different person. They look exactly like their counterpart.

Female lead with supernatural power
Second male lead both a police officer with a prior relation or friendship with the FL

The ML is the same. Both are melodramas and have characters who come together with emotional scars from their past.

Park Bo Young is FL in both. Seo In Guk appears and plays a similar role in both as well. Similar concept, supernatural and fantasy.

Yoo In Na is also the female lead. The ex husband also comes back into the picture. The plot is also disappointing. Different plots but there is also a murder mystery.