Jap-chae is one of the Korea's representative dishes made of dang-myeon(Sweet potato noodles) and other vegetables such as carrot, onion, spinach and mushroom. Sometimes fried egg, fried meat and sesame is added as well. There's no specified ingredients but can be varied according to in-season vegetables.
Main ingredient, Dang-myeon is a type of noodle made of potato/sweet potato starch. So it is more gooey than ordinary noodle made of flour. To compare with Philippine local product, Sotanghon is similar. But Jap-chae is thicker and stickier.
From long time ago, Jap-chae is loved dish for national holiday, birthday and family gathering, etc. Actually, Jap-chae requires quite long time to prepare because each vegetables should be sliced. If you feel lazy to prepare at home, why don't you try in a restaurant near your place?:)