Kwak Chi-eon, having just reached the age of 20, shocks the adults around him by announcing his decision to forgo college. However, he possesses a more defined aspiration than anything else: to capture the heart of Hyun Woo-jong, the older brother next door and his destined match! To his dismay, Woo-jong, whom Chi-eon has known since childhood, is known for being playful and engaging in numerous light-hearted romances. Yet, he often communicates his desire for exclusivity in a rather ambiguous manner. Determined to embrace adulthood and ready to take action, Chi-eon musters his courage and approaches Ujong with unwavering resolve... ?!