According to ChainCatcher, three judges of the Civil Division of the Seoul High Court voted 19-3 in favor of the Fantom Foundation in its lawsuit against South Korean food technology startup SikSin and its CEO Byung-Ik Ahn (SikSin and Ahn are collectively referred to as the "Plaintiffs"), overturning the first-instance judgment of the Seoul Central District Court (which approved the Plaintiffs to pay Fantom full compensation of more than 198 million FTM), dismissed all compensation sought by the Plaintiffs, and ordered the Plaintiffs to bear all litigation costs.

It is reported that on July 23, 2019, Ahn and SikSin filed a lawsuit against Fantom, located in the Cayman Islands, in the Seoul Central District Court. They claimed that they had provided a number of services under the service agreement signed with Fantom (the "Service Agreement"). The Court of Appeal found that Ahn and SikSin not only failed to design a viable blockchain technology, but also committed plagiarism, which brought the Fantom project "to the brink of collapse." The first-instance proceedings were conducted without the participation of Fantom, and Fantom was not aware of the first-instance proceedings. On May 27, 2022, the Seoul Central District Court ruled that Ahn and SikSin were awarded all the relief sought by Ahn and SikSin, but Fantom was not aware of this.