Doojin Construction Company The smart, quality, costless and durable greenhouse solutions for decades in Korea. Doojin’s core values are the quality, technology and eco-friendly agricultural greenhouses construction. The values aim to satisfy the need of the customer. We have built a good reputation over 30 years. Doojin has devoted its core value to improve the crop growing environment of the greenhouse through the development of the safer structures and the smarter systems in the greenhouses. Please contact us at any questions on your greenhouse problems.