“…In addition, loss of control is was a core symptom (factor) in this network. Many studies have revealed that low self-control exerts both a direct and an indirect role in causing PSU (Cho et al, 2017;Han, Geng, Jou, Gao, & Yang, 2017;Kim et al, 2016;Lee & Cho, 2015;Sok, Seong, & Ryu, 2019;Xiang et al, 2020;Zhang, Tan, & Lei, 2020), so researchers believe it is an extremely important element of PSU. In addition, self-control both connects individual variables (e.g., loneliness) and is directly or indirectly connected with nonindividual variables, such as those from family environments (Liu, Chui, & Chung, 2020) and school environments (Humphrey, 1984).…”