The Silent Sea (2021)

If you love Sci Fiction with a mix of horror you would like, The Silent Sea and it also stars the great, Gong Yoo.

#Spoiler Alert
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Includes human experiments in a lab. Both the series give off the same eerie vibes; the fear of what comes next, of the unknown; the struggle against corrupt humans and others.

Bae Doona and Gong Yoo make people laugh by carefully planning strategies, such as matching their mouths even before the start. For a while, he will be frustrated with the more difficult problem of sharing than expected, give off a sloppy charm, and give laughter. As an ace, Bae Doona is expected to solve the problem with amazing reasoning and insight. Attention is focusing on their fantastic chemistry (conformity and breathing).

Both set in a Dystopian future,
scifi kdramas.

The Silent Sea about about an earth with limited water,
Ambergris more about Technology-Human relations

Dystopian scifi.
End of the world literary (Baby it's over outside) vs limited amount of water (The Silent Sea).

Dystopian Scifi kdrama.
Bad polluted air (Joan's Galaxy) vs Lack of water on earth (The Silent Sea).

Dystopian scifi.
An earth with limited amount of water (The Silent Sea) vs
Technology-human relations/interaction (AI, Her)

In Silent Sea, the story, production, directing, casting, and acting (you name it), is excellent. It is an absolutely beautiful story. Both of them talk about space and the adventures in the moon. Both of them discover water in the moon, except the "water" in the silent sea might be a bit different than what you expect.

These two dramas give similar futuristic vibe. The world we know doesn't exist anymore. In BK people lack fresh air and in TSS there is a problem with lack of water. There is a group of daredevils who try to help people to return to normal existance.

Both are Science Fiction dramas and takes place in Futuristic world .

The Silent Sea has a specific mission (Action based, has mystery), however Hoshi Shinichi series has short stories and its drama.

Recommend Hoshi Shinichi no Fushigina Fushigina Tanpen . if you like the other.
Hoshi Shinichi no Fushigina Fushigina Tanpen has mindblowing endings !!

Similarities
-Both dramas are centered around water and the diseases surrounding water. In The Silent Sea some characters become infected with the water that is found on the moon and In Happiness, it isn't the water itself that is the problem but it enhances the thirst for blood once the person is infected.
-Both are military themed dramas. In Happiness, the military is quietly trying to solve the zombie outbreak, and in The Silent Sea the Korean government sends a group of capable soldiers to handle the water crisis in South Korea.
-Both have creepy locations where the characters become trapped in. In Happiness, it is an apartment complex, and in The Silent Sea it is a research base on the moon.
Differences
-The Silent Sea is a sci-fi space thriller where the mystery is mostly what happened to the people inside the research lab, and in Happiness, it is a survival drama where the main characters must somehow survive a zombie outbreak inside an apartment complex.
-The virus is much more fatal in The Silent Sea than Happiness. (surprisingly)
-The Silent Sea has a bitter-sweet ending whereas Happiness has a happy ending.
Both shows will keep you at the end of your seat, highly recommend!!

The Silent Sea is directed by Choi Hang-yong from a screenplay written by Eun-kyo Park, based on Choi’s 2014 short film titled The Sea of Tranquility.

If you are looking for a fun adventure that's still set in space, you may want to try Space Sweepers.