During her lifetime, she was a combination of an angel and a devil. She was proficient in music, chess, calligraphy and painting. When she was about to be destroyed, she saved the person she trusted most, but did not want to betray her in return. She said that if there was an afterlife, he would live a free and unrestrained life, and he must live for himself. Once he traveled through time, she became the Zero who was strong on the outside and fragile on the inside. So can he live out himself in this life? Can he live for himself?