This study aims to discover which undergraduate EFL students face different problems in writing their thesis proposals and how students solve problems in writing thesis proposals. Five students in the English Education Department class of 2019 UIN Walisongo Semarang, who have completed writing their thesis proposals, were involved in this study. This research used a descriptive qualitative, using interviews to collect data. Data collection was analyzed using thematic analysis (Braun & Clarke, 2006) and reflective practice. The findings of this study showed that the undergraduate EFL students had overcome their problems and completed their thesis writing well. However, in the process, when they did their thesis writing, they encountered internal problems like difficulty finding a title or idea, finding theories related to what will be researched, and determining research methods, lack of confidence and motivation. In terms of external problems, there is insufficient support from supervisors. However, from these problems, they create and design several ways to solve problems while writing their thesis proposals. This improves their ability to solve problems as best as they can. Reading many international and national journal references is crucial in writing a thesis proposal, using self-management while working on the thesis, and exchanging information with friends dealing with similar issues. They are not without confidence, lazy, or feel stuck, but they also always motivate themselves.