"Woo-yeon Gong, born in 1993, is now in his 30s. One day, he unexpectedly finds his old cell phone while preparing to move out to live on his own. Among the messages, he discovers an unread text from his first love, Ha-hyun Lee, that he missed back then. Determined to reconnect, Woo-yeon sets out to find him. However, upon their reunion, Woo-yeon feels that Ha-hyun seems to be avoiding him. Will Woo-yeon finally be able to fulfill his unrequited love with Ha-hyun?"