You Hong-june, director of the National Museum of Korea, resigned Wednesday amid a controversy over the museum's display of a misattributed calligraphic work from his private collection. He offered to resign earlier in the day, and President Lee Jae Myung accepted his resignation. You came under fire after the piece, written by a prominent pro-Japanese collaborator during Japan's 1910-45 colonial rule of Korea, was wrongly introduced as the work of a Korean independence activist and was found to be from his private collection. The museum removed the item from its ongoing special exhibition following the controversy. In a statement sent to reporters, You said he has concluded that he should step down "to restore the museum's tarnished honor." "The deep trust the public has placed in the National Museum of Korea and the value our staff has built collapsed in an instant because of my personal mistake," he said. "All criticism over this matter is entirely my responsibility." You, a prominent art historian and author of the bestselling book series "My Exploration of Cultural Heritage," apologiz