Characters meet and bond as children due to events surrounding a parent's murder. Once leads are together they are incredibly devoted and willing to do anything for each other. At one point one of the main characters are stabbed resulting in the other holding them and begging for help. Happy, healing ending after much tragedy.
Both MLs witness the death of a family member as a child which traumatizes them and has a fantasy physical side effect (hearing minds vs. not growing). They become attached to the older FLs who helped them, and search for the FLs when they become an adult, finally reconnecting. Both MLs fall for the FLs first, but she views them as a kid at first. Both dramas have an identical scene where the couple is kidnapped, threatened with fire, and told to choose which of them should live, leading them to state the survivor will suffer more. Both MLs disappear for a year without warning due to the killer, who is still in their lives after all the years.
Both dramas are a combination of the mystery, fantasy, and romance genres and involve a serial killer/kidnapper and the leads having a shared past experience together. Both couples end up living together when the FL is targeted so the ML can protect her and both MLs have a special ability relating to their senses (enhanced vision vs. hearing thoughts). Jin Han plays the ML in both dramas.