This was a tribute to the original show and actors.

* Detective/Inspector Park was played by Choi Bool Am in the original and the 2023/older version.
* Detective Kim played by Kim Sang Soon in the original passed away in 2015.
* Detective Jo played by Jo Kyung Hwan passed away in 2012.
* Detective Nam played by Nam Sung Hoon passed away in 2002.

Special mention:
* Actors Lee Kye In and Song Kyung Chul, were also in the original. They appeared in the last episode of this show.

I hope they release a sequel.

They can do it multiple ways:
1. Another prequel set before the original “Chief Detective 1971”.
2. Remake the 1971 original.
3. A sequel of 1971, set sometime later.
4. A modern 2023/2024 version. Continue the story line of the present time. This time, focusing on Park's descendants, and telling us the other case stories through his grandson.

If they'll choose to do a 2023/2024 version next, then those past case stories can become the 3rd sequel/prequel. For example, it will tell the story of Park's son. Was he a detective as well? How much did he adore his father, the cow-thief detective? What were his achievements?

Doing that way will fill in the gap as to how original Park's grandson became a detective, which is his father (or son of original Park).

There are plenty of ways they can go about this. And I hope they will.