This study presents an international collaboration in the Students Meet Internationally through Language Education (SMILE) project and investigates how the SMILE project impacts Thai EFL students. This program provides students with opportunities to use English as an Authentic Communication Tool (E-ACT) by sharing their experiences and culture with high school peers in Japan online. Thirty-one Thai twelfth graders from a public high school in Bangkok participated in the SMILE project in the 2022 academic year. The course of the SMILE project we describe in this paper consisted of four collaboration classes (50 minutes, four times), and each class consisted of two sessions (25 minutes, twice). In each session, the Thai students met Japanese students in the same school grade in small groups with four or five students in total. These classes were conducted via online channels. Thai students' data were collected from class observations, interviews, and questionnaires. The results revealed that the Thai students: (1) increased their confidence in using English; (2) gained broader perspectives from the cultural exchange sessions; (3) were eager to have similar collaborations with new Japanese students; and (4) showed clear enjoyment in their activities. Given these benefits, we conclude that the experience that student participants gained through the SMILE project had a substantial impact on them, which is likely to change their attitude toward studying English in the future. Besides, we discuss how current approaches to learner psychology may or may not be applied to our findings. Based on the results, the authors argue that having students with different first languages meet online should be conducted more widely in EFL circumstances.