What kind of feelings did Yang Dong have for his mother before he died in "Three-body"?

After being tricked by Shi Qiang into becoming an insider of the "scientific boundary" investigation by the Earth Defense and Safety Department, Wang Miao found an authoritative figure in the field of basic physics research and Yang Dong's boyfriend Rockett. Yi Ding compared billiards to a particle collider, and Wang Miao revealed the current crisis in the field of basic physics research.

That is to say, physics has lost its basic regularity, which implicitly reveals the cause of Yang Dong's death. Although Rockett is not the protagonist in Three-body, she is one of the most important figures and is highly respected. He has appeared in Liu's six works, such as Time Travel, Three-body, Collapse, Microscopic End, Wen Chaodao and Ball Lightning.

He is a famous physicist, so he is nicknamed "sextant". He is an untidy and wandering genius, almost omniscient and omnipotent. He holds two doctorates in philosophy and quantum physics, and is the youngest member of the Academy of Sciences.

By chance, he and Ye's daughter Yang Dong became lovers, and Yang Dong's suicide made Rockett extremely sad. Yang Dong is the daughter of Yang Weining, chief engineer of Yehe Hongan Base. She is also a wizard in the field of basic physics research. She is aloof and unassuming, so many people don't know whether she is a man or a woman who has an important influence in the field of physics.