Tang Luochuan was born and raised in the Tang sect. As an outer sect disciple, he learned everything from the inner sect disciples. Although it was inappropriate, he learned this way since his master taught him so, but in the end he lost his life in the conspiracy of his family.
Tang San grew up in the Tang Clan. He was extremely talented, but he was always an outside disciple. Because he secretly learned the Tang Clan's martial arts, although he was recognized by the elders, he died because of it.
Both of them are members of the Tang Sect, but their studies are very different, and their personalities are completely different. The only similarities are the life they lost for the Tang Sect and the other world they went to after death.