Yuna Lee never thought that she’d get the chance to be one of the few chosen to venture from world to world, completing missions. Her missions - to bring love to the colorless lives of those who have been broken or will be broken by love. However, this wasn't what she was explicitly told. What she was told by the system was:
System: "Good luck, Host. Hope you do your best to stay alive until the endgame has been reached."
"But wait, what are the endgames? What if I die before that? Can you not speak in riddles and tell me straight out?! What is my mission?!"
System: "There is someone who needs your help. Stain their world with your colors. Accomplish the task, gain points and then get the chance to be reincarnated."
"How will I know who is the right person who needs my help?"
System: "Don't worry. When that person arrives, I'll tell you."
System: "I may have given Host the identity of another person and Host may have adapted to that person's personality and identity, however, Host is still Host. Don't think or act the way they do. Think and act the way YOU do."