Okayy sooo SPOILERS AHEAD
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Ilay and his "friends" (crew) bomb a region in Saudi Arabia (I forgot exactly where). It’s a tactic meant to distract the Saudi government, forcing them to focus on the incident. Because of this, Abdul Rahman leaves the mansion with most of the guards. Later on Ilay bombs the mansion to get Taeui out of there BUT Xinlu happens to be there at the same time. He drags Jaeui and puts him in the car, which forces Taeui into a difficult choice: go to Ilay or climb into the car with Xinlu for the sake of his brother.
That entire scene was insane, Ilay approaching on his motorcycle, looking at Taeui in a bright, intense way because he finally found him however everything collapses when Taeui goes with Xinlu right in front of Ilay's eyes, it looked like Taeui is betraying him, even though he has no choice, he had to go with his brother. Fast forward: Taeui wakes up in a hotel room. He has a somehow emotional conversation with Xinlu and convinces him that they can never be together, then Taeui discovers through the news that HE and Ilay are now wanted terrorist worldwide. Taeui’s name and face somehow got dragged into the Saudi bombing incident, and he’s blamed alongside Ilay (they stay wanted for a long time before clearing their names). Taeui wants to return to Ilay ASAP and fix the misunderstanding, but Ilay ofc finds him first. Ilay is furious about what happened, and at first he refuses to listen or let Taeui explain or even speak, he ends up r*ping taeui but eventually Ilay calms down enough to hear him out. A few days later, they go back to Berlin to live together in Ilay’s house.
That’s basically how it ends. Then the second novel starts, Diaphonic Symphonia, which has one of THE BEST Ilay/Taeui moments to me at least

PEOPLE we're SO CLOSE things are gonna get chaotic