Two male protagonists, brothers, master and apprentice he
Twilight Immortal Su Jingning (Xiao Qingyan) vs Lingxue Immortal Xie Xingxue
Su Jingning died in sacrifice, in front of Xie Xingxue.
In order to save him, Xie Xingxue used her original power and gave Su Jingning her beloved Phoenix Ling. His body and part of his soul were preserved and sealed in the forbidden area of Xuanyu Sect's main peak.
Two years later, Xie Xingxue was ordered by his teacher to travel down the mountain and met a young man who looked very similar to Su Jingning.
After accidentally saving a young man, he accepted him as his disciple.
Determination: Do something you know you can't do.