Social-emotional skills rarely operate in isolation. In everyday life, they function as interconnected systems. Using data from the 2019 OECD Survey on Social and Emotional Skills, we applied network analysis to model interconnections among 15 skill facets and compared networks of 10- and 15-year-old students in Suzhou, China and Helsinki, Finland. Across all four networks, Cooperation, Optimism, and Persistence emerged as the most central skills (highest expected influence). At the same time, their roles varied across ages and municipalities. Contextual differences were evident in which facets played the most central roles: Optimism became especially important among adolescents in Helsinki, whereas Cooperation, and increasingly with age, Persistence, were the most central skills in the Suzhou networks. Node predictability was consistently higher in Suzhou than in Helsinki, indicating greater interdependence among measured skills in Suzhou. The Network Comparison Tests showed that the adolescents' networks were more tightly integrated and had greater global strength, which indicates stronger, more interconnected interconnections among the skills. These findings provide valuable insights for designing education programs and policies that promote social-emotional well-being in children and adolescents.