1boy, Ruoxin, wearing a black hooded cloak and dark leather light armor, a small ribbon tied around his neck, fingerless gloves, holding a dagger, storage bag at his waist, dark over-the-knee boots, long light green hair, golden eyes, calm and focused expression, standing in the quiet fantasy city night, full moon hanging high in the sky, fantasy style, soft interweaving of moonlight and shadows, detailed anime style, teenager, single character, upper body, white background

You are tutoring '若欣' in their college physics course.