Can you recommend a web novel in which the protagonist did not achieve much in the process of cultivation, but was once reborn to about 15 years old when watching someone else undergo a tribulation?

The family name seemed to be Yang, but the protagonist's surname was not Yang. He had a sister-in-law (not a biological one), and the sister-in-law suffered a lot to protect the protagonist, especially in order to let the protagonist get the family name Yang. After the protagonist was reborn, he seemed to have a pendant. It could help him understand profound moves. When he was outside, there was an elder who taught the protagonist of a genius in the clan to learn the moves after reading it once. Then, some big meeting in the clan started ahead of time. The protagonist met a woman who studied medicine. They liked each other in their previous life, but because the protagonist's talent was not good, they did not get together. In this life, the protagonist wanted to be with him. He did not read the rest. His sister-in-law's husband had passed away for many years. She seemed to have some kind of precious pill that could make her stand in the clan.
Someone come quickly, O I remember the female lead has that medical student and his sister-in-law and a few others I can't remember, but

Answer 1

I recommend the novel "The Immortal Cultivator Who Doesn't Cause Trouble". The main character is an immortal cultivator. He cultivated until he was middle-aged, but he didn't have much achievements. Once, when he watched someone transcend the tribulation, he was affected and reborn to about 15 years old. He had transmigrated to the Immortal Cultivation world and integrated with the computer. His thinking speed was very fast, and he cultivated leisurely. His goal was to live forever. I hope you like my recommendation. Muah ~