In a small office building, there are three co-workers: Reina, Jaleel, and Sun-Hi. Reina, who is in charge of organizing the office's records, has been working on a private report for the company CEO. This report is stored in a secure file cabinet to which only Reina has the key. Jaleel, curious about the contents of the report, overhears Reina telling Sun-Hi that she will be staying after hours to finalize the document. Sun-Hi has no direct interest in the report but is aware that Jaleel is trying to find out about it for reasons unknown.

One evening after official working hours, Sun-Hi spots Jaleel exiting the office building looking rather pleased. The next morning, Reina discovers that the report is missing from the file cabinet. However, Reina had earlier made a digital copy of the report which she kept on a flash drive for backup purposes. This flash drive was hidden inside a plant pot in her office. Reina shares her concern about the missing report with Sun-Hi, but she does not mention the flash drive or the digital copy to her.

During their conversation, Jaleel walks in and begins chatting about unrelated matters before subtly inquiring whether everything is alright with the report. Reina, playing it cool, assures Jaleel that all is well. Jaleel doesn't press the issue further. Reina is unsure whether Jaleel has something to do with the missing report or not. Sun-Hi ponders whether to inform Reina of what she saw the evening before but is conflicted because she doesn't know if someone could have tampered with the cabinet after Jaleel had left the office.

Considering this scenario, who knows what about the missing report, and what are the possible connections or deductions that can be made about the roles of Reina, Jaleel, and Sun-Hi in the missing report incident?
Reina knows the report is missing from the file cabinet as she is the one who discovered its absence. She is also aware that she has a digital backup, which is information she has not shared with either Jaleel or Sun-Hi. Jaleel's exact knowledge of the report is unclear, though his pleased expression after leaving the office building and subtle inquiry into the report's status suggest he might know more than he lets on. Jaleel's behavior can also imply that he is involved in the disappearance of the document, but without additional evidence, this remains speculation.

On the other hand, Sun-Hi has observed Jaleel leaving the office looking satisfied, which could be indicative of his potential involvement with the report's disappearance. Sun-Hi is aware that Jaleel has been curious about the report and now, combined with her recent observation, may suspect Jaleel of taking it. She has not communicated her suspicions to Reina nor the fact that she witnessed Jaleel leaving the office after working hours. Additionally, Sun-Hi is conscious of the fact that Reina is unaware of whether Jaleel is involved in the theft.

During the conversation between Reina and Sun-Hi, it becomes clear that Reina is choosing not to disclose everything she knows (in particular, the existence of the digital copy). Reina may suspect that someone is trying to access the report and is testing Jaleel's reaction or is trying to protect the secrecy of the digital copy's existence.

Jaleel's knowledge of the digital copy is not established in the scenario depicted. If he truly took the physical report, he may not be aware of the hidden digital copy; his line of questioning seemed to test whether his possible action of taking the report had been discovered. That Reina did not reveal the physical report's absence to him could mean she is biding her time or does not want to reveal her suspicions.

In conclusion, each person holds some information but is also lacking key pieces. Reina knows of the missing physical report and has a digital backup not known to the others. Sun-Hi is aware that Jaleel may have taken the report but is uncertain and hasn't shared this with Reina. Jaleel possibly knows about the report he may have taken, but whether he is aware of the backup copy is uncertain. Reina's lack of surprise at Jaleel's inquiring indicates she might suspect him, but without more information, she cannot confirm this. Sun-Hi is in a critical position as she could potentially connect the dots between Jaleel's actions and the report's disappearance if she decides to share what she saw with Reina.