Four years of entanglement, then waking from a long dream. Qi Yin decided to leave Gu Jiayan and live her own life. But Gu Jiayan gradually came to understand his feelings, realizing that Qi Yin was an indispensable woman in his life. Yet he couldn't give her the love and commitment she wanted, and she'd found someone new. After four years, the dream was over. In the end, it had all been a fleeting indulgence.