From Amazon:
This book contains three separate and unusual stories set in alternate realities. The first story, "Martian's Earth Conquest," tells the tale of a person who is coping with the loss of someone special. The second tale, "Is it Really Not Possible?," makes you wonder if a man and a woman can truly be just friends. And the last of the three, "Sci-Fi," is a sad tale about a girl who hates robots and a humanoid who serves her. The creator, who believes that the best privilege artists get is to ''lie,'' creates a whole new world beyond your imagination. Still, even though these tales are from different worlds, the topic has a great sense of reality, and the readers are guaranteed to be able to closely relate to them. Start a journey to the world only she can create.

From JanimeS:

Kang Han-Se and Ban Ha-Da have known each other ever since childhood. They are close enough to sleep in the same room together at their current age.

"Three men for you," Kang Han-Se's mother tells Ban Ha-Da, on the day of graduation. As soon as Ban Ha-Da's life as a high school student starts, her love life begins as well.

From JanimeS:

Kang Han-Se and Ban Ha-Da have known each other ever since childhood. They are close enough to sleep in the same room together, even at their current age.

"Three men for you," Kang Han-Se's mother tells Ban Ha-Da, on the day of graduation. As soon as Ban Ha-Da's life as a high-school student starts, her love life begins as well.

Through a husband and wife's bickering, everyday life, we can see into their minds and understand why people act the way they do.