[Sword and Fairy/Gu Jian] Young Days by the Canglang and Qingming Rivers

What will happen when Baili Tusu, fresh from Wangchuan, transmigrates into Immortal Swordsman IV? What will happen when there are other transmigrators in this version of Immortal Swordsman IV? What will happen when the man who shares his soul transmigrates too? Baili Tusu thinks the boy named Murong Ziying has familiar-looking regular script. Baili Tusu gives Murong Ziying all the candy Xusun gave him, and ends up giving him cavities... At twelve, Baili Tusu loses the two most important people in this life. At fifteen, Baili Tusu looks at Murong Ziying's familiar features and swallows the name he used to call him, saying, "Senior... Brother." At seventeen, Baili Tusu discovers that he has become the master of Fenji, and also the spirit of the Fenji sword. At nineteen, Baili Tusu goes through even stranger things than he did at seventeen in his previous life. This story features Xiao Qing, Gong Su, and Zi Yun Zi, with a little Zi Sha. Since the story mainly focuses on Ziying and Tusu, there's romantic tension between them. I might even change it to Su Zi Su...