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The mischievous girl, Ling Miao Miao, accidentally enters the mission system of the novel Monster Hunting and becomes a villainous supporting character. To return to the real world, she must complete the system's task—winning over the mysterious and twisted young man, Mu Sheng.

Along the way, they team up with Mu Yao, a member of a monster-hunting family, and Liu Fu Yi, a monster hunter. Together, they fight monsters and level up. As the missions progress, they gradually resolve the animosity between humans and monsters, rewrite the fated ending, and save the world.

Both are mini dramas with the same actor and actress as the leads and there's a little nod to TKIAR in a scene of TD.

Both are Thai horror dramas that have some supernatural elements. In Girl from Nowhere, the main character is a girl that is a supernatural entity that punishes all the wicked students. Meanwhile, in Dead Friend Forever, the main character is a boy that is missing/dead and everyone of his classmates involved in his misery/death is punished for it. DFF has some male-male relationships although horror is the main focus instead of romance unlike a traditional BL.

Both are Thai BL dramas that have a detective theme solving murder mysteries. Goddess Bless You from Death is more supernatural themed while Manner of Death is more "who done it?" theme.

If you like dramas with elements of fantasy like time travel but with the focus being on the characters, their friendships, romances and, life, these two dramas have a good balance of that.
Both dramas include:
1. stories centered around troubled youth/unconventional or unhealthy family dynamics
2. an elements of travel/connection between timelines/parallel worlds
3 a tragedy connected to regrets of the past
4. gangster villains
5. found family/tightly knit group of friends
6. lighthouses...
7. striving to get into university
8. young love
9. special retro vibe, beautiful aesthetics and small town core
10. self-sacrificing male leads

Both dramas deal with court politics where the couple is fighting against the corrupted officials. Deals with investigation and scheming. Both higher quality web dramas.

If you liked Arthur Chen Acting, then this one is also for you.
Also has Immortals as Theme and there are many other great actors and a great Story waiting for you as well.

Though if you searching for romance, the other Recommendations may hit that sector better.
Its more on the Cultivation Path of Things.

if you liked Anti-Hero, 99.9: Criminal Lawyer is worth watching. it’s about a group of stubborn lawyers who take on “impossible” cases in Japan’s 99.9% conviction system. like the anti-hero, the group bends rules, challenges authority, and fights for truth for their clients. the 99.9 drama is brilliant and funny.

Both movies are in a school setting with a classmate that is ill. A romance grows between the classmate leads.

Both are movies in a high school setting. In "Sky of Love" the ML is ill & grapples with falling in love with a female classmate.

Both are movies with a FL who are dealing with a life as a person with Leukemia.........................

Both are movies with a school environment setting where a classmate is struggling with an illness. Having good people around makes all the difference in the world.

Both movies show a relationship blossoming in a school setting as the FL deals with an illness..............

Love Untangled and Who Are You: School 2015 share the core similarity of a secret identity or switched lives, where the protagonist struggles with the ramifications of living as someone else due to circumstances or a case of mistaken identity. Both K-dramas also feature themes of school life, bullying, identity, and a love triangle, with the central conflict revolving around uncovering the truth behind the switch or deception, and a romantic subplot involving a love triangle.

Same Female Lead. Not quiet similar but may do if you can't get enough with EunSoo.

HERE'S FOR YOUR REFERENCE:

The story of the precarious and affectionate first love of a 19-year-old who carries around a letter of resignation.

Genres: Romance, Youth, Drama