I'm glad you like it!
Spoilers:
You cannot enter that room without Sion. And about the code, you can find it in the kitchen where the cupboards are. Just click them more than once and it'll give you the number. No need to apologize, I didn't make it super obvious, so don't worry! If you have any other questions, feel free to ask. :)
And thanks for letting me know about the mistake, there's no way I'd spot it. It's hard to find errors in things you wrote haha. Also, I'm doing well~ Thanks for the support! Hope you're doing well too! ♡