In the Music Machine Game Story, it's possible that the main characters are a group of students. They are in a music class and are introduced to this mysterious music machine as part of an experimental curriculum. There is a lead student who is really into music technology and is the first to start exploring the machine. Then there are some friends of this lead student who have different musical tastes and skills. Some might be good at percussion, others at melody - making. Their combined efforts and different personalities play a role in how they interact with the music machine and how the story unfolds.
Since I don't know the exact Music Machine Game Story, the main characters could be musicians, game players, or just ordinary people who get involved with the music machine.
There could be a young inventor as one of the main characters. He or she is curious about the music machine and wants to figure out how it works and improve it. There might also be a rival inventor who is jealous of the first one's progress with the machine. And perhaps there's a little girl or boy who has a natural talent for music and becomes the key to unlocking the full potential of the music machine. The three of them could have different goals and motives, which would drive the story forward with their interactions regarding the music machine.
Chapter 217, "No Problem, They're All Red Anyway", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with But Director Sun didn't plan to give her any room to think, he...
Chapter 226, "Live Fortune Telling!", is the clearest early answer because it turns Tuttu's situation into a concrete plot event. The chapter turns that into something concrete by moving from What was all that before then? to Are you sure you can be on the list of winners?] Zhou Xu: [?.
Chapter 324, "Enrollment", is the clearest early answer because it turns Zhou Xu's situation into a concrete plot event. The chapter turns that into something concrete by moving from An ancient and majestic building, striped red and white, gathered the...
Chapter 262, "Flash Change Quartet Speaks Out for Jiang Li", is the clearest early answer because it turns Sister Chen's situation into a concrete plot event. It opens with Wen Jiaojiao couldn't stand it anymore and immediately logged onto... and closes on Your manager restricts that as well?.
Chapter 229, "He's Actually Brother Liu, the Watermelon Seller?!", is the clearest early answer because it turns Huo Ziyang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Huo Ziyang's face had already turned deathly pale.
Chapter 314, "The teacher will surely cultivate you into a new music star!", is the clearest early answer because it turns Jiang Shixu's situation into a concrete plot event.
Chapter 464, "Is it Lingzhi?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Li's calculations were indeed correct.
Chapter 376, "I'm Just Afraid You Don't Need Me Anymore", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The phone call fell into a long silence.
Chapter 353, "He's Lying!", is the clearest early answer because it turns Liu Suqing's situation into a concrete plot event. The chapter turns that into something concrete by moving from The three of them turned their heads together.
Chapter 364, "This is the gift our master sends you for the first meeting", is the clearest early answer because it turns Vajra Relics's situation into a concrete plot event.