Oh, I wonder… he could spill the beans at least once. Up to now he hadn't really bonded with anyone, except for Jisoo, who also died. But in this life, he's finally made a friend. If he can't spill the beans to his mother, why not to Jihoon? That would be at least a way to allay the latter's guilt over it, and to vent a little without having to disguise it as fiction.
The downside is if he does that, the good opinion Jihoon formed of his former partner will dissipate. So to preserve the guy's memory, perhaps Ijae will refrain from doing that.