I know you've been waiting for it🕶️

In the Korean comments

One top comment reads, in translation, “Jihoon keeps looking at Lee Kyungmin and grinning; it absolutely gets me.” Another says, “They went to Paris and everyone’s beauty became a six on the die,” using the die’s highest face as a playful top score for their looks.

What the words mean

씨익 (ssiik, grinning silently) describes the shape of a quick, spreading grin. In 개치인다 (gae-chiinda, “it hits me hard”), the first syllable is a coarse intensifier and “being hit” is figurative: the commenter means the grin is overwhelmingly attractive. It is highly casual, exaggerated slang.