He did not blame his parents. If it weren't for them, perhaps he would have died of illness when he was abandoned on the road as a child.
They were his benefactors and would always be his parents. However, he also began to search for his biological father and mother.
The process was complicated, but he finally found clues and followed the trail, ultimately tracing the answer back to Tu Hengsha's family.
They were originally colleagues and friends, and the sudden possibility of becoming a biological sister left him shocked and confused about how to broach the subject. He even contemplated that his original goal for seeking his biological family was merely to know who he was, not necessarily to demand recognition. Perhaps it was enough for him to know silently and care quietly. Yet, he also thought that everything was just his speculation and had not been verified medically. Maybe her family wasn't his relatives at all? So, should he still tell them?