When did Chu Li know about Jiang and Cheng?

in episode 6. They know that Jiang and Cheng are the owners of the bookstore at the Hot Spring Hotel. Variations on Moonlight is a contemporary urban love TV series produced by iQiyi, jointly produced by the good dramas and films of Huace Keton Group, directed by Zhang Boyu, written by Qing Yang, Titi and Zhu Qi, and starring Esther Yu and Ding Yuxi, with 36 episodes. The play is adapted from the novel of the same name by Qing Yang, the author of Jinjiang Literature City. It tells the story that a young novice editor in the workplace, who is full of energy, meets the proud and charming writer of "two faces" at the first ceremony, triggering a sweet and sweet love growth.