Notes: BByong (BByong) is an older slang word to express something or someone vanishing in a magical/cute way. Think of anime where things go “puff” or “pop”. It’s rarely used and almost only in written messages, not common speech. Imagine someone saying: “ok, I’m gone, bye bye – puff!” – this would raise some eyebrows as that person clearly tries hard to be cute (= makes a fool out him/herself).
빠져든다 has the meaning of “to fall/sink into” or “get lost/addicted in” like in “I’m falling into your eyes”.
뿌셔 from 뿌시다 (ppusida), a colloquial variant of 부수다 (busuda, “to break”). Also 뿌셔뿌셔 (ppusyeoppusyeo) a Korean snack, made of uncooked ramen noodles, which is smashed up and sprinkled with powders from the spice pack before eaten, I don’t know if that has any relevance here.