Product Description There is a space to write the date at the top of each page. The ruled pages feature light grid lines. “Line Friends” are featured characters, invented by South Korean designer Kang Byeong Mok, based on the stickers from the South Korean internet engine “Naver Corporation” and the Japanese messaging app Line. Released in 2015, the characters are used in various products, animations, games, cafes, hotels and theme parks.