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Deedee created a topic of Night Song

I didn't really understand what happened between the panels where Jaeshin and Nok saw (or heard?) some kind of threatening event (which mobilized the guards) and the panels right after, where they were both playful and clueless as if nothing happened oO Like why in earth didn't Jaeshin take that threat seriously? I thought he saw the old man then but it seems he didn't saw him until he attacked Nok. In that case what did they saw and what were they saying during the playful time? Anybody can read Korean? :(