On March 26, 2026, singer Baek-kyung Song took to Instagram with a surprising hanja (Chinese characters) deep dive. In the post, he spotlighted two ultra-rare characters that even many Japanese rarely encounter, sharing the fun of studying hanja. The image shows two characters: the first, 『嬲』, means "to tease/harass" and is said to be used mostly in Japan. The second, 『嫐』, carries a similar meaning and is used as the noun 'うわなり'.
Fans reacted in the comments with messages like "初めて知りました," showing curiosity about the new information.