The culprit is Michiya Atobe. He hung Shukawa because the latter intentionally spread negative reviews of the game Atobe's friend developed, leading to the developer's suicide. The suicide note was actually a note Atobe found and left on Shukawa's desk.
Immediately after the case was closed, Rum used Morse code with his teeth, leading to a car ramming into the apartment lot.
Rum sees Subaru’s eye and starts thinking that Subaru is Tsutomu Akai, Subaru tells Conan that they can’t automatically trust people who want to defeat the organization; referring to Rei Furuya and Rumi Wakasa.
The culprit is Kyosuke Domoto. The photo with Masumi and Mary from the hotel bombing case ends up published online thanks to Ogasawara's colleague. Rum realizes that Mary did shrink, leading him to wonder how some died and others shrunk after consuming APTX 4869.
