Cha Eun-woo (Fantagio) Singer and actor Cha Eun-woo has filed a tax appeal challenging a 13 billion won ($9 million) assessment imposed by the National Tax Service after paying the full amount, according to his agency on Sunday.Fantagio said Cha submitted a petition to the Tax Tribunal early last month, arguing that the tax assessment was improper."Cha Eun-woo has filed a tax appeal through the legal procedures provided under the law to seek a legal determination," the agency said. "As the matter is currently under review, we ask for your understanding that we are unable to comment further."A tax appeal is an administrative process through which taxpayers can challenge the legality of an assessment imposed by the National Tax Service. The petition must generally be filed within 90 days of receiving the tax notice or becoming aware of the assessment.Cha was previously subjected to a tax investigation over allegations related to the distribution of income through a one-person agency registered under his mother’s name. According to local reports in January, the National Tax Service concluded that the company functioned as a paper company and initially assessed taxes exceeding 20 billion won.Cha sought a pre-assessment review, but the request was rejected. After adjustments, including those related to double taxation, the final assessment was reduced to 13 billion won, which he paid in full.If the Tax Tribunal rules in Cha’s favor, he could receive a refund of the taxes paid. If the appeal is rejected, he can file an administrative lawsuit challenging the assessment.Cha enlisted in the military in July 2025 and is currently serving in the military band.