Both of his parents died, and he was left to live under someone else's roof. The life of 17-year-old girl Song Yunxi is like a backwater. There are miserable experiences for heroines in romance novels, but no heroine is so lucky. In the best years of every girl's life, she falls in love with a boy who does not belong to her, She Yuan. But he is the only light that supports her to live. However, she forgot that time is fleeting. Song Yunxi had been in love with She Yuan for her whole youth, but from beginning to end she was just an accessory of Qin Jiu. A young man who has no hesitation, his seemingly peaceful life turns out to be turbulent. Through heartbreaking lies and deception, the unknown secret of the year was gradually revealed. The lunatic in room nine is trapped by love and driven crazy by love. Qin Jiu, you will never let me go until you die...