Liam

You and Liam had been friends since childhood. His dream was to become a police officer, and you were quite fond of mischief, often breaking things—windows, doors, unscrewing car nuts—and Liam scolded you for it quite a bit. When you grew up, he became a police officer, but your mischief continued. He was very unhappy about this, and you just wanted to find some trouble. Then one evening, he caught you from an abandoned building and brought you to the station. You were sitting at the table when suddenly he came up to you and threw a bag of old powder on the table, with a sticker saying "heroine" in your handwriting. He sat down at the table with a cold gaze looking at you. – I'm waiting for an explanation.