Lu Yang: "How do you know my mother's name?"
Qin Yu: "... I am her brother, your brother-in-law."
Lu Yang never thought that he would not know that he had an uncle until he was seventeen, and there were two of them! The late mother never mentioned her family during her lifetime, and no one named Qin appeared at her funeral!
Because of the appearance of this brother-in-law, Lu Yang's life gradually deviated from its original track. Lu Yang was tortured and loved by Qin Yu for no reason, and he also discovered his mother's tragic past - unethical love, life experience, disputes, separation and final death...
As for Tang Yibei, no matter how ambiguous he was with Lu Yang before, he was just a passer-by. He didn't take the initiative at the beginning, and what was left behind was naturally only sweet memories with a bitter taste.
Come on ^0^~