Both are adapted from the very same webtoon, while both shows have the same premise, The 8 is a fictional pre-produced drama whereas money game is a reality TV survival k-show

Both are based off the same webtoon
PLEASANT OUTCAST is adapted from part one of the webtoon while Concrete Utopia in based loosely on part 2 of the webtoon, so PLEASANT OUTCAST is kind of like the prequel to CONCRETE UTOPIA in a sense, they both take place in the same universe and they both deal with the same topic of survival and power struggles

Both of these dramas have romances between divorce lawyers but in one drama the leads are divorce lawyers at diferent times in their lives.

Both dramas deal with the topic of death of a loved one and using VR technology to reconnect to them.

Both series follow three women on their journey to execute revenge on those in their social and personal lives. Also, both series have cheating spouses.

In splash splash love we get a taste of science and innovation, if you want more of a story showing these things you should watch Jang young shill it focuses on king Sejong's interest in astronomy and the real Jang shill a inventor

Both dramas deal with the time travel of scholars from the past to the future who end up staying with the female lead while searching for a way back to the past

Both reality show showcase military training.
" The Soldier" is an elimination competition type of program, whereas Real Men Show celebrities experiencing military life and training.

Both dramas have witches
both are running food establishments
But they kinda drama have opposite feels, one has a light romantic comedic feel while the other has a dark fantasy feel.

Both of the dramas plots are following a story in which humans have mutated and the people how haven't must fight to survive in an apocalyptic setting.

Both the leads of their respected dramas are doing the work of dealing with other worldly beings by removing them from the human world. While one helps spirits and their loved ones resolve grudges to pass over the other removes mystical creatures from the human world. What they have in common is they are both placed in this position because of rules they have broken or wrong they have done in the past.

-Both leads are hundreds of years old
-Both dramas deal with the topic of reincarnation
-Both dramas have humans that are connected to or have supernatural powers

Both dramas are comedies that focus on a family's daily lives and their weird comical ups and downs in life.