Recommendations

While these shows don't have a lot in common when it comes to plot, but the leads (and their calm-ish demeanour), the overall vibe, indie music and cinematography make these dramas really similar otherwise.

I have yet to watch the drama (Gyeongseong Creature), since it hasn't been released yet, but I already see a few similarities such as:
Genres: Action, Thriller, and Sci-Fi
Cast: Great, Fairly Well-Known
Concept: Humans and Monsters/Creatures
Involves: Investigations

Both share the same Genres: Action, Thriller, and Sci-Fi
Both share a similar Concept of: Humans and Monsters/Creatures in the same world
Both share similar Tags related to: Supernatural

Both share the Concept of Humans and Monsters/Creatures in the same world
Both share the same Genres: Action, Thriller, and Sci-Fi
Both share the similar tags related to: Supernatural

Safe Skies, Archer is the second/next book after The Rain in España :) Same characters, but different focus.

Both share the same Genres: Action and Sci-Fi
Both have similarities with a Concept involving: Humans and Monsters/Creatures
Both have the tag: Supernatural
Both have a Cast that is: Well-known (many popular actors/actresses)

An exact copy of the story.

Both FLs remind the powerful men in the royal family of their previous love.

The FLs are constantly exposed to threats in the harem.

If you enjoyed 'Sweet Home,' I recommend diving into 'Hellbound,' as both series share a gripping blend of intense storytelling and supernatural elements that will keep you on the edge of your seat.

Love Senior and 23.5 both center around main leads who are sapphic and currently in uni. Also, each story features two side gl couples along side the main couple.

Liu Ling is a young member of the royal family who has been granted the auspicious title of Princess Chang Le by the Emperor – who has a soft spot for her (and thinks little of her father). She is aged 20, and until now she has lived a pampered and privileged life. She is capricious, impatient, and quite bratty. Even when people lavish gifts upon her, she treats them with disdain. She has a habit of rubbing people up the wrong way and acting impulsively – a fact that has seen her develop many enemies at court. Even the common folk have a habit of spreading malicious – and often totally unfounded – rumors about her. On her birthday, she decides – on a whim – to travel out of the palace to drink in a private room at an exclusive inn. She drinks herself into a stupor and is sleeping off the alcohol when Shen Yan, a young army commander and an ice-cold martial artist stumbles into her room after having been injured in a sword fight with a notorious bandit. The Princess falls for this wounded warrior and tries to win his heart – although he initially doesn’t seem very impressed with her advances. But, given time, could this unlikely duo strike up a friendship – or an even more unlikely romance?

Both include serial killings from 20 years ago which are left unsolved, in which the victims were young women and the main character was assumed to be the killer. In both we suspect almost all the characters to be the killer or at least related to the killings.

Same director, same vibes, same genre. Both set in sea villages with main characters who have met each other before in childhood and teenage years.

When Shiho Nishina got worried about her sex life with her husband, her husband proposed to her, "Why don't we go to a couple exchange party?" At first Shiho strongly turned down the idea, but eventually, she gave in because her husband was very persuasive. "We're just going to observe, okay?" Shiho said as she reluctantly agreed to it. Meanwhile, a former diplomat Mr. Kubozuka ran a couple exchange club, "Aquarium," with his wife in their house. At first, Shiho was being very cautious, but gradually, she got attracted to Mr. and Mrs. Kubozuka's charm and finally agreed to exchange couples with them. It seemed that their sex problem had disappeard and they had found happiness, but as it turned out, that was just the beginning of their nightmare...

The story begins when the main character, Tomo, who is liked only by men who have a girlfriend, starts a service called “Subscribe Kanojo” on SNS. It depicts the intertwined love lives of women who become “girlfriends” through a monthly subscription system.

What if there was a subscription service that allowed people to have a "safe affair"...? An ordinary housewife who has never thought about having an affair falls into the swamp of an adultery subscription service that she started out of a little interest and finally sinks into the abyss.