This article examines Vietnamese students' motivation for learning Mandarin Chinese during their study abroad in Taiwan and their construction of self in relation to this language learning motivation. A combination of several concepts of ideal L2 self, ought-to L2 self, instrumental motive, integrative motive, linguistic capital, and multiple self-aspects is used as a theoretical lens to gain insights into the students' Chinese learning motivation. The study employs a qualitative research approach in which semi-structured interviews with English-medium students from five Taiwanese universities were conducted. Findings reveal that the students' motivation for learning Chinese contributed to portraying their ideal and ought-to Chinese selves, which subsume their different instrumental and integrative motives for language learning. The ideal Chinese self they would like to become possesses Chinese linguistic capital, which would confer on them advantages pertaining to their study, career development and social relations. The students' ideal Chinese self also incorporates and reinforces their (desired) cultural, economic and social selves. Implications for supporting international students' motivation for out-of-class language learning and their construction of self at the institutional level are then discussed.