Three years after entering a boarding school simultaneously with his father's remarriage, Yu faced graduation. After a fulfilling student life, he celebrated with his friends. On their way home, his stepmother, Yuna, ran towards them with a smile. The two, overjoyed at their reunion, celebrated his graduation. However, Yu ended up carrying Yuna, who had drunk too much out of happiness. Despite leaving home to try and forget his feelings for her, the woman he had always admired, his feelings resurfaced, overwhelming him. And so, he once again climbed the stairs to adulthood.
