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It looks like that IT guy might now try to blackmail Seo Ilmo, since he was obviously saving that file (and I'm assuming it's quite likely he looked through the contents after that before telling Ah-in it was unrecoverable). If so, I'm curious to see how that goes for him... Usually, things tend to not go very well for people who try to blackmail killers ╮(￣▽￣)╭
Either way, Ah-in should have definitely insisted to keep looking over his shoulder the entire time. With sensitive files like this, that should be common sense. Though I suppose it's understandable that he was distracted due to being extremely worried about his friend at the time.