Midoin Seongsu is a restaurant in Seongsu that serves Japanese-style steak and rice bowls. The steak is tender and comes with a sauce, and the menu includes cube steak rice bowl, mentaiko pasta, and beef noodle soup, all plated neatly. The dining room has warm lighting and wood-toned interiors, and there is a wait. Food comes out relatively quickly, and the portion of the steak rice bowl is moderate and filling.