There's another case where German comes to the rescue, as there is nothing even approaching an English equivalent…
I love the English language because it's so simple. (Almost) everything makes sense and there aren't too many rules. For a native German speaker, it's always nice to work with such a straightforward language.
I put this in spoiler tag, just in case, the scene where gyu ho is coming back to seoul, never happened in the novel, and the director said, that this could be a backdoor for season 2 😉