Everyday for a year, Sunggyu received paper swans which had floated down by the lake. When he unfolded a swan one day, he realized that there was a message written inside from a mysterious person he called "T" for "tokki" because of the cute drawing of a rabbit they always included at the bottom of the pages. Sunggyu wrote back the next day and sent his own swan across the lake, which wasn't that large but still required a boat to get by. From then on, this became a part of his daily routine. At first, T was like a friend or supportive sibling but after a while, Sunggyu felt like he knew him so well. Or maybe not, since he still didn't know T's real name. Who is he?