He is the son of Major general Tin Sein, a former Deputy Defense Minister of Burma.

His vocal support for the anti-coup movement and criticism of the military regime drew the attention of authorities.

This arrest followed his online statements that criticized the incumbent military ruler, Senior General Min Aung Hlaing, and expressed condolences for the late senior National League for Democracy member Doctor Zaw Myint Maung.

Following his father's arrest, on 26 October 2024, Nay Shwe Thway Aung posted on his Facebook story: "Doing such things makes the people suffer... Let's think carefully."

In Burmese, this reads: "အဲ့လိုတွေလုပ်လေပြည်သူကနာကျည်းလေ.. စဉ်းစားချင့်ချိန်လုပ်ကြပါ.." Nay Soe Maung's arrest highlights the risks faced by individuals within Myanmar's elite, revealing the ongoing tensions and challenges to dissent against the military government's authority.