I feel like Yura is pink clouding.
For people unfamiliar with that term, it's when someone suddenly recovers from a trauma or addiction and are in a euphoric state of mind. It's like a honeymoon effect during recovery. They'll be super happy, throwing out "I'm fine", "I feel great", "I'm over it", "I'm all better", but in reality it's a sort of delusion when first feeling the relief of recovery. When that sort of high (so to say) wears off, that's when people start having a mental spiral, relapse, or worse.
Yura is definitely showing symptoms. He's basically ignoring everything that happened and is just overjoyed that it's "fixed". It's only a matter of time before those years of trauma start haunting him and it's anyone's guess what the final outcome will be. Even though he "merged" and everything seems great, this would be the best time for him to seek medical attention and therapy, although it's something he needed long before this.
If the author ends it like this then it's very unrealistic and seems like a lackluster ending. A lot of mental illnesses have been covered in this story so to have pink clouding and therapy incorporated into the ending will personally feel more fulfilling. After he's taken the necessary steps to proper recovery will his relationship with Jinsung feel more genuine and safe.
Just my prediction not a spoiler.
I think since the MC doesn't live with his mom, it's going to take a bit before he finds out about the concert being deleted. I'm sure by that time him and his crush will be moving forward with their relationship since the plot is hinting at them going on the aquarium date. Once MC finds out about the concert deletion, he's gonna be down in the dumps about it. But I have a feeling the crush is going to eventually come clean about being the singer and he'll give him a private concert
Also, I bet that one celebrity dude is crushing on the 3 idiots not knowing they're guys