Sometimes the happiest memories will be the most painful sufferings. In the past he was the happiest man on Earth. For the sake of others he gave up his own happiness.He was the "master of sacrifices". But at the end he had to leave everything behind. Including his family,soulmate and friends. As our destiny is not up to us, we cannot predict the future.Once he left the world with hatred and then he returned back to get revenge on behalf of someone else. Though he met his soulmate,his brother and his friends, abscense of a certain person made him suffer with those 'once happiest memories'. So he decided to write his thoughts as a letter that will never be delivered to the 'reciever' as she is not longer alive. Letter to senior sister from A'Xian. This oneshot is written with situations related to 'Mo dao zu shi' and 'The Untamed'. So all the credits for the situation descriptions goes to auther of the novel and to the drama. This is just a idea popped out in my mind. Hope you guys will enjoy❤