In the morning Kristof went out of David's apartment in a hurry because he already had an appointment with someone he called last night and asked to meet him. Usually, Kristof wouldn't be like this, especially with someone he just met. But he had a special reason that he had to do that.
The reason was regarding the necklace that David threw last night. What is known to be an exorcist necklace from an article that Kristof found last night! Kristof felt that he had to confirm the truth of the story and directly meet the person who was also wearing the same necklace but with a different motif from the necklace that David had.
Kristof also didn't tell David about this because he knew that his brother was hiding something from him. Including Abriella. The mysterious woman that David suddenly took to the hospital. Kristof also clearly remembers the first time David called him to go to the hospital immediately.
Flashback