Preppers Diet Food Suyu is a salad and diet food restaurant near Suyu Station in Gangbuk-gu, Seoul. It serves myeongi namul bowls, salad pasta, perilla oil cheongyang pasta, and dakgomtang, and also sells protein shakes. The restaurant is open 24 hours and food comes out quickly. The space is large and clean, making it suitable for a comfortable meal with plenty of protein.