This paper analyzes the factors that influenced South Korea to issue TRUST diplomacy and made Indonesia as the object of its diplomacy during the Covid-19 pandemic. In previous year before Covid-19 outbreak, Indonesia and South Korea had experienced stagnation in strategic economic cooperation negotiations, but the two countries managed to reach the agreement in the early of 2020. This research will use qualitative research methods. Based on William D. Coplin's theory of foreign policy making, it was found that domestic political conditions, the influence of sentiment on trade liberalization from the business group, the decline in South Korean exports due to the trade war and South Korea's relations with Japan, and South Korea's status as a middle power country in the world as well as Indonesia's position as a bridge for South Korea to enter the ASEAN market which is the biggest driving factor for South Korea to carry out TRUST diplomacy in Indonesia. South Korea took advantage of the pandemic momentum to appear to form a positive image and increase the confidence of its strategic partner countries