I'd mistranslated two things in the previous chapter:
1. "April" should have been "Month 4"
2. "Yeonja" was based on katakana, but the proper hanja is "Young-ja"
Apologies
Thanks for the encouragement 🙂
@Grimmycoffee: I didn't find anything either, and believe it's Oribe describing things with sound effects, like his "ugyaa".