To believe that love never fades away She believes in that She loved him from the very start He knew that Sometimes the person you love can't return the love you give She thought of that He went away to fulfill his dream and  a promise He did that She wanted to forget So she tried to find love again He came back to look for her But it was too late She was ready to face a future And forgot everything about him

When Kyungsoo decides to move on from his first love, he came back