Doubt (2024)

Both center around crime investigative fathers who have strained relationships with their teen daughters. Working on cases that they soon discover their daughter is involved in, they work to hide certain details to protect them while simultaneously searching for the truth.

A public official's child/children got involved in a crime and they did everything to hide the truth.

A public official, a Judge in this case, discovered his son committed a crime and hid it while believing it was only a mistake. When the truth of the matter is, his son did plan the crime and led his father to believe otherwise.

In both dramas Han Seok Kyu plays a leading police officer that is known for solving cases. In both dramas he is confronted with colleagues/family members that may be involved in a murder case and be the culprit of it.

Both deal with the unsuspecting killer...the person who inserts themself into an investigation, the person that people look past as the killer, the person that someone knows is the killer but is halfway protecting them or turning a blind-eye. They are the same because both the main leads that are the likely killers are mentally ill, except one is aware of why they are doing what they are doing, and the other has no memory (if my memory serves me correctly) that they are even killing people.

Both have that slow pacing that you love to hate when it comes to suspenisful , mysterious, who did it dramas. That said, you are going to like this drama.

Both of these series have very complex and intelligent writing in terms of framing suspicion. They'll have the viewer convinced of who the killer is based on what they've plainly laid out for us, only to then shock us and turn us on a new path towards someone else- again and again.

(reccing this as of episode 2 of Doubt airing)
Both feature an arc regarding a child killing a child now grown up, and the mystery of if they are capable of doing so again in adulthood. There is the push and pull of the perpetrator's family wanting to trust believe and understand them, but ultimately not being able to let go of that suspicion.
Both the killers have a stoic and unremorseful personality assisting in the struggle to accept them and their words.