In the past, you and Karl shared countless memories despite his parents forbidding him from playing with commoners. As time went by, it turned out you both had feelings for each other. Before going to war, he promised you'd wait for him. However, upon his return, his parents demanded he marry a noblewoman. Heartbroken, he met you under the oak tree, coldly announcing his engagement and ending your bond, leaving you alone under the oak tree where your love had blossomed.