Both are korean dramas are about zombi. In both dramas they are associated with, a curse and in both dramas people try to use them for their gain.

Both are about zombis dramas. In both a facility that wanted to create something different but accidentally ended up creating zombis instead.
Both have a male-female duo trying to investigate the situation and find solution out of it.

Both movies deal around a natural catastrophe that set the world into chaos. In both dramas the characters have to find a way to survive. The only difference is that Ashfall revolves around a volcanic eruption while The Calm Beyond focuses on tsunami due to a storm.

Watching one reminded me of the other. Both take place in a dystopian world where each has to survive. While The Calm beyond focuses on a natural catastrophe and the aftermath of it, Alice in Borderland pulls the people into a game.

Reverse gender roles. Both dramas revolve around the idea of what it would mean if men where confronted with situations women face. While Hiyama Kentaro no Ninshin deals around the idea that male pregnancy was as likely to happen as female pregnancy, Ooku emphasises on what it would mean if males where put into the roles women faced in ancient historic times.
Both are very bizarre productions but make one question about societal standards and norms.

In both dramas Han Seok Kyu plays a leading police officer that is known for solving cases. In both dramas he is confronted with colleagues/family members that may be involved in a murder case and be the culprit of it.

Both dramas revolve around police officers that discover their child may be the potential culprit in a murder case they investigate and are now confronted with moral decisions of what to do.

Both dramas take place in a similar time period although Shogun is set in Japan and Queen Woo on the Korean peninsular. Both dramas try to accurately represent a the time period, and both are about the death of a king and the power struggle over the throne. Both are dark and eery.

Both dramas are done in an omnibus style characterised by a set of horror/thriller episodes that are not related to one.

Both dramas have a dark, eery and sinister vibe to them and are from a similar artistic feeling. Both dramas revolve around characters that question if they are witnessing/involved in a murder case or not, and investigate that. Both end up doing questionable actions and doubt if people they live with are murderers or not. By doing so, they get pulled deeper and deeper into the case. Each drama is full of twists and turns and is a very gripping thriller.

Both dramas revolve around a man in a rural area getting involved in a murder mysteries that reconnects him with his past. Both do questionable actions, while also teaming up with a detective to solve the case. Both dramas give off the same eery and sinister feeling.

Both dramas revolve around sisters taking revenge on the bullies and abusers of their younger sibling. Both leads have a very similar personality and both go to extreme length to accomplish their deeds.