The Light That Fails to Dim (слэш)

Wei Ying lost his parents in a night hunt. Cold and alone, he wandered the streets of Yiling for nearly two years. However, one fateful night, a tall, scary man finds him and takes him back to a place he calls Qinghe. Later Wei Ying, now known as Wei Wuxian, discovers that that tall, scary man is not bad at all. And his cowardly brother makes an even better friend than he initially thought he would. With a content feeling in his chest every day, Wei Wuxian can only hope these peaceful, happy days with his new family will last until the end of time.
Or, in which Jiang Fengmian is unaware of what happened to Wei Wuxian's parents and Nie Mingjue takes him in and the story continues from there...
Thai trans: https://www.readawrite.com/a/4a9aa6e28a66711f27eda0f78687bac3
Korean trans: https://lees1908.postype.com/category/the-light-that-fails-to-dim
Spanish trans: https://archiveofourown.org/works/25176430/chapters/61013815
Another spanish trans: https://archiveofourown.org/works/33043813/chapters/82022920
Russian trans: https://ficbook.net/readfic/10339204