One Day: Seiya no kara Sawagi (2023)

In both dramas, the main characters are investigating a murder related to themselves.
Both of them have absolutely no memory of any events when the case occurred.
The difference is, the main character in One Day doesn't remember anything at all, whereas in The Killer Inside it's only the time when the case occurred.
And then the how the twists revealed presented in both also remind me of each other.

The way the main characters are introduced and the main plot focus may be slightly different but both characters have similar backgrounds and similar goals.

Both main characters are fugitives in a murder case and while on the run, both try to find the truth behind it.

Both are mystery dramas with unique characters, lots of plot twists and surprises along the storyline. The two dramas are very interesting and funny to watch.