Go and Cool Off While You're a Substitute.

The eldest lady of the Yun Group, Yun Linlang, returned to China after recovering from illness. She found that her fiancé Gu Shiyan and her younger brother Yun Fengmian were attracted by Qin Fei, who looked similar to her. Qin Fei also used the "code book" to predict the future and wanted to unite with the Gu family to overthrow the Yun family. Yun Linlang exposed the betrayal, broke off the engagement decisively, faked her death and worked with Zhou Heng to crush the conspiracy and gain love.