He was originally a pampered young master in this world. Once he traveled through the world of immortality, he was bound to the system and became the master and elder brother of the male protagonist.
His mission is to rescue, influence, and teach the skills, guide the male protagonist to the original plot of the male and female protagonists, and also cure the male protagonist's blind eyes.
As they stayed together day and night, the male protagonist had already developed a deep love for him, and his love was so deep that he could no longer be separated.
It turns out at the end that they are hiding something.
Intention: It doesn't matter if we can't meet each other in love, it's enough for us to have each other in our hearts.