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Alright here's something trivial I learned from the raws:
In the raws yirim always calls cheogho by adding the -ssi like "Cheong ho-ssi", which is a formal way. And cheongho usually calls yirim by his full name "Dan Yi-rim". So baby yiho has learned to call his daddies "dda-yi" and "deo-wu" lol. But at the end of this chapter cheongho was shocked because yiho calls him "deo-wu-i", which means yiho learned from yirim to to call him "cheong ho-ssi". Imagine being called in a formal way by your baby lol.