Sinjo Jjamppong is a Chinese restaurant in Seoul that serves jjamppong, jjajang, and tangsuyuk. The pork broth comes with spice levels adjustable from 0.5 steps, and single-serving tangsuyuk can be ordered. There is a one-person counter for solo diners and takeout is available, and a wait can form even at 2 p.m. on weekends. The cleanliness of the utensil holders, tables, and phone stands is lacking.