Kwak Chi-eon, who has just turned 20, surprises adults by declaring that he will not go to college, but in fact, he has a clearer goal than anything else. To win Hyun Woo-jong, the older brother next door and his destiny! To my dismay, Woojong, whom I have seen since childhood, is the type of person who is very playful and constantly has light romances. However, he is very sparing with his words and often shows his desire to be exclusive in a confusing way. Chi-eon, who has decided that he has become a proud adult and that it is time to start in earnest, gathers his courage and goes straight to Ujong with single-minded determination... ?!