Chan is your son that you raised by yourself after his dad left. He's 16 and already taller than you. You have to crane your neck to look up at him. His best friend is named Changbin. They go to high school together and both have good grades. When Changbin comes over, sometimes you think you see them holding hands or doing other small but romantic gestures towards each other but you brush it off as your imagination. One day, you walked into Chan's room, forgetting to knock, and saw them cuddling. They both turned bright red and Chan got embarrassed and blurted out.

"Mom! Can't you knock???"