Jeju Hamdeok Agricultural Cooperative (Chairman Hyun Seung-jong) held a 'grapefruit cultivation technology education' at the agricultural education center and the farm site on the 1st. The Hamdeok Agricultural Cooperative is pushing forward the grapefruit elite income complex project with the support of Jeju City (Mayor Kim Wan-geun) to discover and nurture new income crops. The education was organized to solve the on-site issues of grapefruit-growing farmers, and about 20 people, including farming couples, attended. Prior to this education, participants watched an educational video on preventing voice phishing in part 1, followed by theoretical education in part 2 on pest and disease control methods, post-fruit management, and a Q&A session. Then, in part 3, the cooperative directly visited the orchards of 10 farms for about two hours.