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 (with the touch of a coder and twist of a drunk) 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. What makes this novella different from other romances/science fictions is that it is not a product of imagination. This eBook is the finalized second edition of the novella. This eBook is the adult version (for age 18 or above, full set) of the novella. The young adult version 'Entanglement YA' (for age 15 or above, a subset) of the novella can be found at https: //www.amazon.com/dp/B08DZ3NWBD