Recommendations

Toxic Relationship between Leads.

Male Lead is depicted as a Anti-hero!

Male Lead is a Gang Leader!

Both heroines are tough and stand their ground against the hero!

Dark Romances!

Both have episodic investigation
Supernatural Cases and Romance
Ghosts,Monsters and demons are hunted

Time loop + ml and fl good chemistry

Time loop

Has a similar vibe, reflective of life, mature feel and strong female leads with some romance. Both are an enjoyable watch and slice of life for women in their 30's.

Both are thrillers
-Both have a revenge plot
-Both FLs are ruthless and cold
-Both FLs are vengeful
-Both FLs are "masterminds"/calculated
-Both have Sociopath Female Leads.

Both female characters are strong, independent and badass, they manipulate to get revenge and punish who wronged them and strategically takes them down and unraveling secrets on the way. They are both thriller and crime dramas with psychological elements.

Both dramas are psychological thrillers touching on themes of manipulating people, with a mysterious female character with similar plot twists.

[Rampant] is a story about a zombie outbreak set in ancient times. Similar to [I, Kill], the protagonists struggle to survive while pursuing their individual goals and protecting their loved ones.

Both are zombie dramas set in ancient times, with [Kingdom] taking place during Korea's Joseon era. The female lead in [I, Kill] is reminiscent of the one in the Korean drama, as both characters serve as assistants to a doctor in a remote village.

[Kingdom Season 2] concentrates more on the struggles of the living inside the castle in Hanyang city when another outbreak spreads. To protect innocent citizens, the crown prince and his allies risk their lives once again, facing not only the undead but also the court's political conflicts.

Both are zombie dramas set in ancient eras, with [Kingdom] set in Korea's Joseon era. The female lead of [I, Kill] is similar to the one in the Korean drama, as both work as assistants to a doctor in a remote village. [Kingdom] focuses more on the male lead, the Crown Prince, while the Japanese drama's main female lead is a former ninja.

Both FLs are quest driven sole survivors who have died/nearly die. Both have a magical lamp that gathers spirits. Both MLs hold a secret, either their identity or goal, from the FL as they assist her. Both dramas have characters who are the spirit/wick of the lamp in human form.

Both tell stories about family and its problems, then finding happiness. There are stories of fathers and children, as well as stories between siblings.

Both dramas have similar vibes. Going to a parallel universe/in the past and changing a character's life path.

Both are stories centered around SA, how family members influence the decision of whether or not to report, stigma, corruption by those in position of power, and the emotional toll of it all. The MLs seek vigilante style justice in their own hands from the offenders and serve time for their acts. The FLs demonstrate both despair and resiliency, ultimately relocating to rebuild their life.