Lee Ahn and Jin Yeong had an on-and-off relationship for nine years. After a breakup, Lee Ahn learns of Jin Yeong’s death and inherits his locked phone, which will erase all his memories if she enters the wrong password ten times. While struggling with the loss, a man named Jin Yeong, with similar traits, joins her company, rekindling memories of her ex. Ahn must enter the correct password before it's too late.
