The proposed research aims to investigate whether fans' loyalty to a brand is related to their idol or not when a brand changes its celebrity spokesperson. Celebrity endorsement is an expensive but effective marketing strategy that helps to increase brand loyalty and persuade customers to purchase the endorsed product. The literature review suggests that celebrity endorsements have a positive impact on the financial returns of businesses, and the attractiveness, credibility, and expertise of the celebrity are the three components of a successful celebrity endorsement campaign. In addition, brand loyalty is a multidimensional construct, which includes attitudinal and behavioral loyalty. The proposal includes a review of the literature, a methodology section, an ethical statement, a conclusion, and an introduction to the research timeline.