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Similar theme: The female lead is ensnared in a manipulative relationship with her fiancé, who exploits her medical talents for his own gain.

Again both dramas are mystery/detective dramas
One of the main actors in unnatural Fire is the main lead in My roommate is a detective too.
Again... Heavily friendship/bromance focused
Multiple case solving while containing an over arching plotline
Buddy cop duo!

Both dramas are crime mystery dramas
Both dramas contain multiple case solving plot with an over arching storyline
Both dramas are heavily friendship focused and focus on found family and team bonding
How can I forget... Bromance!!!
Both dramas are focused on a specialized element in the crime department. In under the skin it's forensic sketching and in unnatural Fire it's fire investigation

similar in the advance tech
similar rom com vibes early on.
both have issue about self-view.. (me too sobs..)

Revenge to similar villian characters, the grand princess. Even tho The Double didnt have "reincarnation"/"rebirth" plot, but it has second life time chance

Pastor Park works to expose suspicious religious groups. He's hired to look into the cult group Deer Mount. Meanwhile, Police Captain Hwang investigates a murder case and the main suspect is a member of the Deer Mount cult.

A work that depicts the mysterious story of a man who has been deprived of a part of his body by organ hunters and becomes 'connected' with a person who has received an organ transplant.

Ha Dong Su is part of a new human race called Connect. He has an immortal body, kidnapped by a group of human organ traffickers. His eye is cut out from him. He soon sees something and realizes the man who has his stolen eye is a serial killer. Ha Dong Su is now able to see what the serial killer sees. He chases after the serial killer to stop him from killing more people.

Dong Baek possesses an extraordinary gift - the ability to delve into the memories of those he touches. His remarkable talent, striking appearance, and no-nonsense approach have made him a world-renowned detective. However, his penchant for using fists before words can be a headache for his colleagues. On the other hand, Han Sun Mi, a prodigious profiler, passed the bar exam at twenty, earned a criminal psychology doctorate, and attained the rank of senior superintendent. She's a genius in solving cold cases, motivated by a personal secret. When these two exceptional professionals encounter a serial killer with abilities beyond their own, a thrilling battle unfolds.

Zhang Hai Feng quits his job as a police officer after the death of his daughter, Duo Duo. However, one day, a serial killer case reveals new-found evidence about the accident that led to Duo Duo's death. In order to find out the truth, Zhang Hai Feng starts to pursue the serial killer and in the process, dies together with him. When he wakes up, he finds himself back in the past; one day before his death occurred. He decides to make use of the wormhole and save Duo Duo from her death. Eventually, he starts to unravel deep hidden secrets of the people around him, and the web of conspiracy that was planted 20 years ago.

Both are BL dramas with characters that are red flags, and have jealousy, obsession, manipulation and control. The main character is stuck in a love triange (or square). In Futtara Doshaburi, the MC has 2 guys fighting for him while in Secret Relationships there are 3.

Both are anniversary Sentai, both have a offbeat sense of humor that makes the world feel crazy although Gozyuger has more story so far

Both are Thai BL dramas about the entertainment industry and red flag love interest. In Top Form, both main leads are actors that are lovers to rivals while in My Stand-In, one main lead is a stuntman/aspiring actor and the other is a model/buisnessman in the industry.

Both “Love and Leashes” and “You’re My Pet” center on unconventional romantic dynamics that play with power and role reversal. In each story, the female lead takes on a dominant, guiding role while the male partner embraces a more submissive, almost pet?like position. This pet play element isn’t just a quirky plot twist—it serves as a metaphor for exploring intimacy, trust, and breaking away from traditional gender expectations.

This show is also a good show to watch as well because just like the Road to Kingdom showing more on underrated groups so does Peak Time so you should give it a try

Both shows are basically the same thing but with different groups and added quests so if you liked Road to Kingdom: Ace of Ace then you’ll like Road to Kingdom