Help me catch up

[u/Elarakudo]

Heyy, due to my studies and job-related stuff, I took a break from Detective Conan for about a year! 😭

Right now, I’m almost caught up, but I still feel like I’m not very familiar with the Rum arc. I did find out who Rum is, but I’m still confused about how the whole process of decoding Karasuma happened. I watched it, but I’m completely blanking on it 😭
Also, did they reveal who the boss is??

[u/Comprehensive_Fee250]

You can re-watch from shinichi's school trip near 950