One day, right in the middle of the Seoul Spring Festival, the colors began to fade from the Hangang River. The flowers were still blooming, but everything felt a bit dull, and the laughter and energy of the crowds just weren't the same. There was only one reason for this: the Key of Spring had disappeared. Just then, a faint giggle echoed... "Hehe, caught me?" It was the mischievous fairy, Bombomi. Bombomi hid the key and scattered clues to its whereabouts across 7 different locations along the Hangang River. These are clues you can only find by actively enjoying and experiencing each spot! Every time you find a clue, the color and energy of that space will be restored. Now, it's time to become a Treasure Hunter, collect the clues along the Hangang River, and find the hidden Key of Spring. Right now, follow the Hangang River, find the clues Bombomi hid, and recover the Key of Spring!