Nick Nelson is 19 when he first moves into his apartment, becoming an independent(ish) adult. He is 20 when his next-door neighbor moves in. The once quiet apartment is now loud, bright, and outgoing. After the 5th day after his neighbor - who has only lived there less than 3 weeks, mind you - is blasting music at an ungodly hour, Nick decides to confront his new neighbor, who he has never even seen once. Who knew asking someone to turn down their music would change someone's life? Definitely not Nick! Heartstopper AU! Please read the A/N!