Same supernatural scenario and also main character having like an amnesia then went out to discover the truth. The story is not exactly the same but the vibes kinda align.

- They are both thriller but doesn't follow the same storyline.
- I prefer Parasite over Intruder
- For some reason they have the same vibes.

- Different storyline but has the same concept about family, LGBTQ+ and also comedy.
- Paolo Ballesteros also stars in this movie.

- JiSung is also the main lead in this drama.
- Both main leads have a rare diseased and gets help from the female lead to get better.
- Both have lots of medical terminologies mentioned.

It's most similar in the play of psychological thriller sense. Although Cello is caught up between supernatural and psychological, Insane also gave that thrills and chills with it's great execution of the plot.

For me Insane is most similar to the kind of movie I imagined Cello to deliver.