Return to the Cardamom Dream and Find Your Sweetheart Again

The heroine missed her sweetheart because of work, but the next day she traveled back to high school. She looked at her lover who was in her twenties, and made up her mind to get him back. But what she didn't know was that one month after she traveled back in time to meet her lover, who was still in his hair-cut years, his lover also traveled back in time.