It is the novella that one can finish reading in 2 hours and may find loveful for a lifetime (the first of three of the series 'Understanding & Endeavour'). So many quotations, songs, novels, movies, and tears after, there is still no definitive answer to the almost perpetual mystery. What is love? Can love be explained by neurotransmitters, their prioritizations, memories, decision trees, and human logic? The answer is for readers to find out, and this book of rarest supply may save them a lot of trouble. It may bring changes (perhaps life-changing) to people who appreciate it. These changes can only be positive, never negative. More information can be found at www.twitter.com/ctauyang. ** SOME ADDITIONAL INFORMATION ** This book is a jigsaw puzzle in two senses. Love is a solvable problem, and it takes, after reading, at least 5 to 10 hours of research to form a complete picture in mind. Some intelligence and life experience will be required. It may look like fiction of romance, but it is about self-help in disguise (explained partly by science). What makes this novella different from other romances/science fictions is that it is not a product of imagination. This eBook is the young adult version (for age 15 or above, a subset) of the novella (second edition). There is no description of anything sexually explicit, consumption of alcohol, and violence in the book. It is the estimate of the author (according to his own experience) that the minimal age should be 15 rather than 12 (the usual definition of young adult is 12 to 18, but it is misleading because adult is the noun, which means 18 or above, young is the adjective; the proper definition should be 18 to 25) because of the need for maturity to understand. Of course, anyone of age 18 or above can opt for this vanilla version and may find the reading experience more pleasant and easier to accept. The adult version 'Entanglement' (for age 18 or above, full set) of the novella can be found at https: //www.amazon.com/dp/B086MKYLJ2