Cheung Yuk Fan feels suffocated in Hong Kong after 2019. 2021 Summer, She resigns from her job as an arts administrator and rents a flat in a sub-divided unit in an industrial building. She is determined to hide herself in this small world and start her own online trading business, forgetting about the distractions of the outside world. But one day, the beautiful sound of piano playing next door suddenly leads her into a realm of fantasy and illusion.