Explain with Visual Keypoints Like a Real Mentor! A Benchmark for Multimodal Solution Explanation. - Jaewoo Park 003; Jungyang Park; Dongju Jang; Jiwan Chung; Byungwoo Yoo; Jaewoo Shin; Seonjoon Park; Taehyeong Kim 001; Youngjae Yu (CoRR, 2025)