The book is like a diary, where you keep the moments and the personal stories. In particular, this book is also a place to share your thoughts and feelings without worrying about other users identifying you. In contrast, you cannot know exactly other people except by their nicknames. It allows people the opportunity to release their thoughts and feelings that are hard to disclose in front of others at a specific period of time or long term, aiming to help people with better mood and connect with other people who may have the same or similar perspectives.