It's a Gu Yan novel that is being serialized. The story mainly describes the profound friendship between Wen Heng and Lieluan (formerly known as Wen Rong, Liejiuqing). The novel was originally named "The Imperial Doctor's Concubine: Nine years old, I can't stop! 》。
Story details: Before Lieqi was born again, she felt that everyone around her was good, except Wen Heng, who was nine years old, who was the worst to her. But when her life came to an end, she found that everyone in the world would betray her, and only that man was willing to love her with his life. After rebirth, Wen Heng was the only one in Lieyi Nan's heart.