In this collaborative project, a digital collage was created to represent the scene of sisters' house-sitting. “The theme of this project is a scene of sisters staying at home one day. Their parents both work and they are key girls. While they are away from home, they build a secret base just for them and wait there cutely and innocently until their parents come back. (From the concept of “@_abuhua_”, I expressed the cuteness and sadness of “waiting” for their parents by using materials and luminosity, not doubting that their parents would come back and finding the fun of a secret base within themselves. A special place just for the two of them was recreated in digital collage to express a sense of security and adventure. The sisters' innocence is depicted in vivid colors, conveying warmth to the viewer. The contrast between light and shadow is used to emphasize a sense of loneliness and sadness.