Recommendations

• Both feature supernatural investigation teams solving bizarre cases.
• Both series feature villains who want to become the most powerful being.
• some characters possess special abilities
•Both shows explore deeper lore, mixing mythological elements with government conspiracies

Both dramas have revenge towards bullies. Both include high school bullying. The Glory is darker than Study Group, but if you loved this drama, then also give The Glory a try. I'm pretty sure if you watch it, you're never gonna regret it.

Both are mini dramas in which the leads approach each other, each with hidden motives, and end up falling in love.

Both are mini dramas in which the FL is a general who is killed or believed to be killed and then gets a second chance in some way (time travel vs. new identity), setting out for revenge on the ML who see wrongfully believes killed her. Both have an almost identical opening scene in which the FL is shot by an arrow within the palace walls as the ML looks on.

Both are about one of the MLs who committed suicide and is now trapped in a room and the other ML who moves into that room.

Both are BLs about the relationship between a human ML staying in a room haunted by the other ML who is a ghost.

Both are Thai BLs about the relationship between a human ML and a ghost ML who died tragically in high school.

Both are BLs in which one of the MLs dies tragically and the other is given a chance to go back in time and try to undo what happened, only to learn the two have a predetermined fate. Both MLs have a somewhat forbidden relationship (stepbrothers vs. age gap). Both dramas have a bittersweet/sad relationships as the leads cannot be together.

Both are Thai BLs in which one of the MLs is a tutor to the other who has a rougher attitude.
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Both drama are about bullying in school
In both drama ml is great fighter
Both drama are funny and also gives you a lot of motivation for studying
Most disgusting and horrible bullies (i hate them)
Best action scenes

Dark high school series vibes with bullying and fighting between students. There is also a sense of mystery and a strong and complicated (non-romantic) relationship between the 2 main male characters as they navigate the school system.

Both are psychological thrillers BL dramas where there are killers and deception involved. There are hints of supernatural elements as the story goes back and forth in time for both. Both shows are written by the same author Sammon who specializes in writing crime and mystery stories.

JoongDunk the actors star in both BL dramas which have crime and killers in both. There is deception and uncovering of secrets as the drama progresses. Joong is the serious character and Dunk is the playful character in The Heart Killers and their roles are reversed in Dare You to Death.

Both BL dramas follow a group of friends that has one (or more) of them trying to kill the rest while all of the group's dirty secrets are revealed as they try to find who is the serial killer.

Complex story of innocence and revenge. How tragedy affects even those who stay at home. War and Officialdom. Cause and effect on people. Love story mixed in between.